Malicious PDF — malware analysis report

Static analysis result for SHA-256 138bfbb8d3f000ff…

MALICIOUS

PDF

88.5 KB Created: 2021-06-25 19:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b0f3528e99dd8d1660befbec4f0686d8 SHA-1: 276acef646be77243fa3affb3927b0df7619aac0 SHA-256: 138bfbb8d3f000ff180b904bbcc1f35b970ec5f00fd508eb601836f84386ecb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=appraised+meaning+in+marathi PDF link annotation
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ehugsgimqre1hokcd41ggom7r7/60603704490.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/70101624924.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160925434b3772---fepipiwi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b363d3342---sararovuzivero.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/d84cf97fafefa7d0b711209f515a9e8e/71615435854.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac565306171---5185799073.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/sudasenosupojuxog.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210511234313771.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e7a36e9b---79510135706.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b261828dff5---ginunut.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/45304816628.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/26951853081.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ac2196f5---37672221971.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210615210007_xoz896.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/18385436720.pdfIn PDF document text
    • http://agrion.org/upload/fichier/70945565692.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/27165217284.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5f9592c08---xuborimawageg.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d022ea5e629---12765710903.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0b57f6e5cf2da82a47328829408e1b5a/93243482622.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dda7b10fc---nawesanitajesino.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d071aec2badbdf3498e03da34599e8ff/89831248492.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3048a9c73---47966036459.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a9282b84ebd095a54676aac57b98c06d/58114930599.pdfIn PDF document text
    • 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_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 18236 bytes
SHA-256: 92488774e289a84edde208f43f938e6685973e738a718d001f19eae80a4e5c53
font_01_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 10652 bytes
SHA-256: 40ef3c56cae8b97d642342a77f5fd5da734375d02af40a89a732c4452a99a6c0
font_02_sfnt_off00013b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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