Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0561f3b6106a9bb…

MALICIOUS

PDF

92.4 KB Created: 2021-08-14 22:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d77778dfb14de45f2f6ddf44290b4836 SHA-1: 4abf87bac42395833596f05ff1493707cd39f084 SHA-256: a0561f3b6106a9bb82675c0162af38cb763d0ab484d9b4b38946f67db27f868e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised WordPress sites and other disposable hosting domains. The presence of numerous links, including one pointing to a raw IP address, strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://windowsplusllc.com/ckfinder/userfiles/files/toreseselapapeke.pdf In PDF document text
    • http://sllight.ru/design/img/upload/file/vasozevikimijotijas.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610e12db2d5d7---xavinulisu.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e3480b4efad16699c6f0ac1d1bb81da4/65118409451.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/kumagorujutako.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/podikomoganobunuwu.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/18969424751.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/ledogilituneluwilikolow.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/981793956.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/35594793003.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/13713539804.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc469fc0d---wadonuriju.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/pabegig.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/39898696660.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/29364854190.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/6a1cefe562951e2f196e61f4acdd5970/sekamovuxifare.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/jagowe.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/4025561845.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/33231073202.pdfIn PDF document text
    • http://watch62.ru/files/files/desinonubakowoxokinix.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c13d3f145---mufipujemirikuwus.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df6d2f2997---78635488576.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd719a9c53---14581888055.pdfPDF link annotation
    • http://vswet.ru/f/95024628986.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab9b4e194---baber.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=samsung+galaxy+s7+edge+user+manual+pdf+downloadPDF 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_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 11180 bytes
SHA-256: 0b5e318cc1df7e5aed43d7cbae9ad7b632d9dfaae9669ca845dda0099e70de42
font_02_sfnt_off00013582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13582 16708 bytes
SHA-256: 669e7855afc995ccdc4784a780ff1dcb3ee861d783423da90ab2b969ed08b9b0