PDF malware analysis — malicious · bb0e5dce62fd59af

MALICIOUS

PDF

76.8 KB Created: 2021-09-06 23:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 85d99340da705f66aa86b39294bbd53a SHA-1: 45e3916559654c4d5b9a1024b6ca5584de038010 SHA-256: bb0e5dce62fd59afc2035226207b5526af69462c4afcb7435fd7a7818558a1a0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9901

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://nomylo.ru/uplcv?utm_term=exclamation+mark+worksheets+for+grade+2 PDF link annotation
- http://interwork.sk/userfiles/file/26377425171.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611732b4535c3---tubiwubanulid.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/oohtuaraltp78155shqla60pf5/66642142348.pdfIn PDF document text
- http://thepdaitruongphat.com/upload/ck/files/3565829456.pdfIn PDF document text
- https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/455978846d8ba1eb33c657ade8c4bde9/77342598539.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611e06566a6c7---70827045836.pdfIn PDF document text
- http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/bunuronefuxe.pdfIn PDF document text
- https://whatshoulditcostme.com/userfiles/file/55062645971.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf58289662---84760803349.pdfIn PDF document text
- http://rc-modeller.se/images/file///kojokexudamowuxuxovag.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607853c60e567---36455194058.pdfIn PDF document text
- http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd2418923f---62062101481.pdfIn PDF document text
- https://infypos.com/infyposcms/media/funizuraxesiparufasij.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b7c42ec7---15807837428.pdfIn PDF document text
- http://bukharasuwanee.com/sites/default/files/file/37603389352.pdfIn PDF document text
- https://iva-vietnam.com/userfiles/file/31388024865.pdfIn PDF document text
- http://edgecs.net/documents/50514513650.pdfIn PDF document text
- http://cuanhuadanang.vn/uploads/image/files/64774867161.pdfIn PDF document text
- http://techbico.vn/uploads/image/files/12334240198.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8af7b096085efcddf9d7be5b27f2a70b/15432738142.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/bd3c59900bdeb0572a55990d38474c99/99409716876.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7f476c6198210396298f470d9ee73146/58517405863.pdfIn PDF document text
- https://istocdukkan.com/userfiles/files/zubufukisivifer.pdfIn PDF document text
- http://re-media.ru/foto/ck/files/46450070645.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/xizogepukovebowexudekej.pdfIn PDF document text
- http://capri.lt/userfiles/files/sujirotomopigizovinomelax.pdfIn PDF document text
- http://jlm-kg.com/uploads/file/7912263364.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c707.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC707	16872 bytes
SHA-256: `90d1c6533eb036909dd748c7c936a75857a32284aa8a0ec811dc7fd7942c7ae4`
`font_01_sfnt_off0000f283.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF283	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A9A	11308 bytes
SHA-256: `53d49dc7166759f04baa40a5beefdca60da698ebb2f7b7300fe9188096b24f50`

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