Malicious PDF — malware analysis report

Static analysis result for SHA-256 1faf47eae2d218d3…

MALICIOUS

PDF

88.6 KB Created: 2021-07-03 21:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fa4cac14f84076070a77141feab69f50 SHA-1: 79c9aaced9152c988bbca02a8a1e1dd6ba0716c0 SHA-256: 1faf47eae2d218d3f85c6beb53a879345182113c6c42120b0170e12b3acaa01e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609674a412e9e---genor.pdf In PDF document text
    • http://davidhammerstein.org/userfiles/file/sufamegogekexusalivunegup.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/zuvolimumiminaraxobu.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/mewizezadud.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/201658e64d44aeafca3f4ab330c9c2c0/49852397149.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qp3atdoq24co8ghqege9j6elgb/mewodemog.pdfIn PDF document text
    • https://diphong.com/uploads/pamulabepuvaxivaf.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b520rl97valc6cg4g5ehcp0fl2/42566380034.pdfIn PDF document text
    • http://polletnv.be/uploads/files/24648320266.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16074c48057990---tedidipixudaj.pdfPDF link annotation
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/8c899008158d31ae9fe2a84bcc42bd08/jaforusarapasusolumejiror.pdfIn PDF document text
    • https://autopratichesas.it/file/tolizutosejuraralujuv.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/14psai3huaf86ku0otubh5h79n/70483055409.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d09aeb8c503bffdefee857ae77dfd3da/fejifekovul.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077261dcc23b---ginexizigazetagururo.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/04a3c6f014b67c00a0f6e9210043ed1a/wivizo.pdfIn PDF document text
    • http://yejida.com/userfiles/file/ximiwarumotifasevozikapog.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/pasog.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/lumadetigerawu.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/luwavamexezaxa.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a02ed77902b---49304246412.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5db6807a1---82217771791.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/t2ff4q2ehhjljmhsjpr3a7796h/81480132024.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae9aeb82d---42794418420.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/29063651435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=legato+meaning+musicPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 17940 bytes
SHA-256: 743992dd295e5bcf11c2c82c72b83dae3d92d1c5ac532493a3672e40be6db1b7
font_01_sfnt_off00012424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 10484 bytes
SHA-256: c628e04686b2c9b36684caf27e4553fb28c2c1f745bcbeeaaae53783945ddff1
font_02_sfnt_off00013bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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