PDF malware analysis — malicious · 8920a105d3e378ec

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 21:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 411b80eaf7cae4c540f8e3dd26879194 SHA-1: 1343e581b56b171a56ec33ac501bde3f50dcfb2b SHA-256: 8920a105d3e378ecee52cd2629b18196fe758dc1a953a8af2f5b3584c1bbf877

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of distributing links across potentially malicious or compromised sites. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://pistant.ru/uplcv?utm_term=unlimited+night+vision+minecraft PDF link annotation
- https://patriciobanados.cl/upload/file/In PDF document text
- http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c52a962a2---7458790626.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/903q3qat5npv2qgs12dttje8s2/19733415447.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9deb867b2---jafeti.pdfIn PDF document text
- http://telmeed.com/web/ckfinder/userfiles/files/zebewuwiderunololemapot.pdfIn PDF document text
- http://cuatudongsaigon.vn/uploads/files/3808780756.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ed62b160d1c5c0eac8834d6e7b25b657/33046204627.pdfIn PDF document text
- http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859d76722c3---dazodan.pdfIn PDF document text
- https://contabil-fiscal.ro/mm/file/roketi.pdfIn PDF document text
- https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0208f6f338---memojigireruvuwotetenasi.pdfIn PDF document text
- http://parfumkin.ru/files/files/75716643446.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce085df0ce---bobatugilobub.pdfIn PDF document text
- https://elminhaj.org/userfiles/file/39504485606.pdfIn PDF document text
- http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b84650af19b---73042278016.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6d905c928040a07e190f9d13af3209c7/muvuvefexavesezojemavex.pdfIn PDF document text
- http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b870b6de1---73261391464.pdfIn PDF document text
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/57f11c7511cf884192482b906f4198bd/lilemogupemigamijis.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a401d4821cb---rinavuvaduwososuduzuf.pdfIn PDF document text
- http://truhlarstvisollner.cz/data/file/93531464680.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gcsnmpe5n50g22fkeu1k52ls35/21199277536.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dc8dce5421725673da201e283a72d855/ravegesedap.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb8ca46d8a---vidunejafe.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16ba9a5dda---28765693014.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a16776a0730---kefetotaginipelanima.pdfIn PDF document text
- http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfc208b4f8---61452481058.pdfIn PDF document text
- https://mvpartners.be/images/uploadedimages/file/gobuwibatadujazirujigivu.pdfIn PDF document text
- http://fujiya-burbank.com/uploads/files/lewedarinozoge.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_off0000efe6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFE6	10996 bytes
SHA-256: `bd2d0b4e5bde7e53a6708c78eff44c699ddc94aed778ef32fcd6ce28d11ace59`
`font_01_sfnt_off0001090b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1090B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001211d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1211D	18528 bytes
SHA-256: `0bbc0712c63f147e8c6ca393a8a74200aebb2e9a9ce9552d92c2b6a14dfaf3b5`

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