PDF malware analysis — malicious · a10c3a261f9ada1f

MALICIOUS

PDF

88.6 KB Created: 2021-07-03 09:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 9b46547c42583c5f3b014667452f8d13 SHA-1: ebb48f4a61a0eadddec2959c7d1e49daf5ccefc4 SHA-256: a10c3a261f9ada1fe6da67deb5cfacb326d6307fc8ad42112970070d022ab383

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The PDF contains numerous external URIs, suggesting an attempt to redirect users to malicious websites for phishing or further payload delivery. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with common PDF-based malware delivery techniques.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 https://nomylo.ru/uplcv?utm_term=my+favourite+book+paragraph PDF link annotation
- http://henrysadiereunions.com/clients/876463/File/gajoj.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce9f468b8---38662202950.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5185db75---kogoru.pdfIn PDF document text
- http://akvari-um.ru/userfiles/file/dimilij.pdfIn PDF document text
- https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/q1u80fqr040hf9l48joa9diphv/kozizovitanaloga.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071040970a07---wamoxugoburagoditaw.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083031801e55---bekapizuxiwotiv.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2eda44099---51491370041.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3667f67b3ed35c07be264f7566ff788c/81383997445.pdfIn PDF document text
- http://szrealty.net/uploadpic/2021-6/file/2021060104175473499.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/r5tvo26mc4djuuoc5ui11h4p4d/37559880398.pdfIn PDF document text
- http://10glazsikeyrosa.ru/file/majivunagujababufigupum.pdfIn PDF document text
- http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7585cd34d---gukujapekibojil.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/abdd8b83573a91c32d9df4a582d379d6/tabivijebamupiniwus.pdfIn PDF document text
- http://alexanderkanevskyartistbiography.com/clientMedia/file/27062524275.pdfIn PDF document text
- http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756c0503288---5391493184.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b22970a06c1---ronoriderez.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7a420d9a95847c7cf64f8ddec19fb226/tovuwokevotawajokowili.pdfIn PDF document text
- http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pomawetodalajopekaw.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0c4c65eed2bcdd5e159de4450e229c30/60240660133.pdfIn PDF document text
- https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2rkuas0he51o2tpma59k24rtgs/mosorop.pdfIn PDF document text
- http://446888.top/userfiles/file/37600726981.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/2529577137.pdfIn PDF document text
- https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b38f95a049---mixerovexojekuzekem.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4nb3cogj66jde3t8q2cfuad9t5/17543249145.pdfIn PDF document text
- http://barnesfamilyre-union.com/clients/52050/File/lafifezolujaragewuruv.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_off0000f7fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7FC	10824 bytes
SHA-256: `53d50b8e180f9b0cf2dd3f09583d99195886eee7b42a97c06c214da3daf5d8f4`
`font_01_sfnt_off000110f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110F0	17188 bytes
SHA-256: `a5b2d4c9b48a621a896f44c5f00c1523d05190ffa3dd8d5bb0f27616c5ee1459`
`font_02_sfnt_off00013d11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D11	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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