Malicious PDF — malware analysis report

Static analysis result for SHA-256 593dbfd2e075bcc7…

MALICIOUS

PDF

68.7 KB Created: 2021-05-10 09:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da81d4d55ea9f68b69d1ef42b576ce59 SHA-1: 512d2e0e515d3d30d3a591a557ff3f819ee54e8b SHA-256: 593dbfd2e075bcc731c7af86d56dbd58cb6bbccbe65d9b473795895d5869de4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm designed to obscure the true destination. The document body, though heavily obfuscated, suggests a lure related to 'Staples white return address labels template', indicating a potential phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://amandatravel.com/userfiles/file/beketamigaf.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffc5e4371---97116648765.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607147814401e---72816607597.pdf
    • https://sasalidayanisma.org/uploads/file/12392284087.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/3c0d632559bcb9aa31258b5251b6d55c/patokosifuna.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/0f8e6c538e1faad605b680975b4be40b/18343167332.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073770e0d9c5---rakejefujuluf.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ca4771c3---tivomavixutaludidoj.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607224cc5179f---jozazorekadelakukegamusax.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7935f134---watuxafesebixovolo.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/834fbcb845ca9947f5b9d7791e996646/bonagururufuwinefofibobe.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/116160d82ac24ea6148d440cd1b04151/80738902699.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b45168175---vekovasufoxe.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ed6afcb4fcc389d4477089ce034459ee/xurezuzizemidegirexozan.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/25189398b06f6a615f3059abb11e5c48/13293161440.pdf
    • http://agiusfuneraldirectors.com/files/file/mezigitaxe.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083817113174---gotejinapimo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=staples+white+return+address+labels+template
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfef.bin
415e229fb4cac536a043019bffdc84ef9319f417c292271dbee473fa4fe762eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 5536 bytes
font_01_sfnt_off0000e29d.bin
42fce7080541e3abd401313bdb9fe1756d348b2910e0e2b2a34a7b422fbe8249
pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 10344 bytes