PDF malware analysis — malicious · efb629ebc2f88e33

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 21:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 7fa52a05ef387c88420894a76f425647 SHA-1: d95b332e0b98f457515709290574d87ece119d65 SHA-256: efb629ebc2f88e336c5ca490e470e963a79268983b4afeb2796f16cb8499a79b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's designed to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

Heuristics 6

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 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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae434874c20---5826265691.pdf In PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cacb083e1cf---60496625133.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/478d3861a20633c5b472352e30a64cc9/73345922794.pdfIn PDF document text
- http://mega-gold.com/userfiles/files/84410516145.pdfIn PDF document text
- https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a6e619a95---60297438651.pdfIn PDF document text
- https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c23da9f66c817ec4061a87baed322235/68812929228.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/27ae7945372cf0a252c3485f5beda565/lewesisigerefegivevapesaw.pdfIn PDF document text
- https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1b5fa19a0300255385e0dbf9ef9c5d29/65233799435.pdfIn PDF document text
- https://steklo-shik.ru/userfiles/file/23508908357.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e838f8a4---favifi.pdfIn PDF document text
- https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/dc2d232bb1e4d105fb11d233bb23b5ba/vetetuzixumarutag.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ee77ab322---sowuzasad.pdfIn PDF document text
- http://biirbeh.mn/images/content/file/zaludonapuvu.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607923f223160---7695696348.pdfIn PDF document text
- http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e58da269f---1222088757.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee47c1d7e---18689356451.pdfIn PDF document text
- http://fashioneducation.ru/userfiles/file/mevuj.pdfIn PDF document text
- http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gapubalesofegedowupul.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69f8f42b76---55544627437.pdfIn PDF document text
- http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/87799523544.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/9m0v2uhjccddihn2i7rc6g9kha/87579880519.pdfIn PDF document text
- http://edgecs.net/documents/30365420689.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d5b31e2e---tupixiwonakukafulajaji.pdfIn PDF document text
- http://euro520.net/userfiles/file/16224042531140979105.pdfIn PDF document text
- https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608373fa411dd---dujobepuxulo.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/dinepuwizalijom.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cos+135+degrees+in+fractionPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d5a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5A3	10996 bytes
SHA-256: `6d450aa0478a7f024e878081a33d8f31a38fe6e66e4abb40707a8e0c80998b1c`
`font_01_sfnt_off0000ef2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF2E	16088 bytes
SHA-256: `450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c`
`font_02_sfnt_off0001045f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1045F	19048 bytes
SHA-256: `7b4e89af415b73aa444463af5d71291e7191730534efd9a243f02e25caf8d985`
`font_03_sfnt_off00013766.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13766	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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