Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0aa39afa3bc4b57…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 06:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3326fd2fa9c649d8bff42a6a83950e7e SHA-1: a05d5ea7776a17da4e83e51cb5e15cb8723fc964 SHA-256: c0aa39afa3bc4b57d8f7b1065c8474809122a7711fac96095408f28afc514662
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URIs point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of many links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098db39c8676---kulabafakobokeruzo.pdf In PDF document text
    • http://m2m2design.com/userfiles/62380247131.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/39197837445.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/307b859557aa1feaa654786e0488bb0d/78876826781.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a611e039cf---fosobejedoviwawiziku.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d5f1c28a7ec6852c1a8e022f6db76123/95693242965.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/bbotqa4e66pdhnussanbrpru19/34563109193.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/64673602567.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/84466894557.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c853a35a08e---sokuxuvutumilizezepepixij.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd133c9ab---69747148836.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609a88bd3fadf---43931115788.pdfPDF link annotation
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e4235cec---26774419210.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/bitilobopiro.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be047149074---35384629193.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/vibajusilokodinosotowo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17fe2ac9fa---10325108652.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/28919260874.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/7e6380a8127b6b51dc9097e22caabdb1/mejebopesi.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/depefunasufekikumu.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d5741e563cc25744091ad4e3a0817f63/kofalelowafikunovoniwuli.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb2b394a6---guxixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hottest+anime+picturesPDF 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_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 17104 bytes
SHA-256: d426742b0cb604313b7d9745e1bf46d291f672806241a5abd1afc1f3587e3b10
font_01_sfnt_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 10580 bytes
SHA-256: 928a3f230a60b24f0fbd0f1b7c7cb6e0dab0333e6cbf5f83c75cc7c62fa5118a

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