Malicious PDF — malware analysis report

Static analysis result for SHA-256 8055ed78c02d9bb3…

MALICIOUS

PDF

88.5 KB Created: 2021-09-04 22:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 06d0a4067db8e1ccb1271833e1ad0bd5 SHA-1: e3badd0bb093d1be297e5320526c8782902525bf SHA-256: 8055ed78c02d9bb3184971b956420f12c50b6b8f789441dd49faa56df2afb9db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not explicitly detailed, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=work+design+occupational+ergonomics+7th+edition+pdf PDF link annotation
    • http://marcobernini.it/userfiles/files/medifivololovogijivezawa.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abe33be46ec---95759824877.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/80716469067.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tonepumizukaroja.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/wugiselasuzan.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3869dd73f7b7b682c0fe98af9316aad/21263622782.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/38c45606b2f99adaf2c3972dd12fd317/88242472593.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f4366def5e29c93875837d6eac3e53d0/75123577824.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/geturamugudifepomu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80c0fb3d6b---ximukoniki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d1927e43---99028855252.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d48ec4a0275ded64654cb5a28ad57405/92799606266.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1cc4e9626480cd9404537c9cf5db399a/siwogadajowumeporidunov.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/morutilivedozixuz.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fee56edf288f8561063fcdfb3c232c39/77317012933.pdfIn PDF document text
    • https://cmf8.ir/data/file/zepofofujidex.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hu837vog2c80a5130lsgjdphip/sanabolejozesujuresatinex.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/13887119790.pdfIn PDF document text
    • http://promador.pl/userfiles/file/zenudogukogubu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f3fd313e---jibejonekixuvawuxibe.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd05d184c8---29906188185.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/21133415516.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/14806890166.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/939f0403575f10bce9b2701a86d99dc7/vawesanajizisotowewij.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 11304 bytes
SHA-256: b6861a472a839c284f2b3b75479c976137fdaead6e07274e7bb08c37cd375811
font_02_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 17384 bytes
SHA-256: e20c05949bdc7dce69add5beedcd4adc9efe1d5ed4c35239e4280a61991e2cd9

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