Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27e2996fc00467a…

MALICIOUS

PDF

100.9 KB Created: 2021-06-25 23:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4097dae8f0e4bfa1f60c731b6d75e88f SHA-1: 8ada3864ec47da82e8fff26176f6cf0aaafdba7d SHA-256: c27e2996fc00467a01cf9f7a8d4c7341349ae49747b6cc2ec24bf30f48766a67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=british+food+quiz+questions+and+answers
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b5e251600---31210320651.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/3d540b1fa7087908c5553b3b5944eac0/52657851266.pdf
    • http://stark-tools.ru/images/uploaded/371656990.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608715229f8a0---4459280728.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ae7de1164d730edcbf1818d7f7990aa2/roxodupatofijukagerofasik.pdf
    • https://hondamienbac.vn/userfiles/file/54691331078.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b548ea9d8---33899809459.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/18083978461.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/siguvobomimuna.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45510978a3---fivokolabevovagutojasod.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b0891eaa8dbdf7783ac9b6349bbfbc18/fepokiluvuribikiluriwo.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf01ed507---35712582865.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/fabaf0176c35196c01e3a11b798ef67b/6126090858.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae39a94a417---femudukederibuj.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tsnojremcigckpsiv4liuelcp6/kobezobi.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/f5hg0ji0gbu5cqldm387h3ajof/58598500669.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b313e9bf737---89300647173.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ca1bab526e9d835dfc60b89f9d2c5eec/88433816079.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/59922065663.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/2fdecbd47585015225f546ac1c0d2805/motonifalosulowebuvemana.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/i0sjodfep4t4oj7u75e928vmp1/97960628501.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/tefvg22fck0artji4hfsjtpp13/manoziloligekulerivapeb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012232.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12232 16792 bytes
font_01_sfnt_off00013a49.bin
7025277c32228a78b9917c059d1efba205d77684690a7ed4af4c1e854cff5b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A49 10852 bytes
font_02_sfnt_off00015339.bin
6229ad88845032109297239cc2cc27a6cdf67ec07ecc992f3dc41712fe284b9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15339 19440 bytes

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