Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5d4c114b2b9f72…

MALICIOUS

PDF

77.8 KB Created: 2021-06-28 14:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 691b25b201b825d7a74772851b1d8112 SHA-1: b3e73b4b5e7380f4ef38d9186a72a63b5c5ee681 SHA-256: 7c5d4c114b2b9f72f0c1f91ac2b147a00710ce70a0ec5e94c10870c47a64ef49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with multiple URLs pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bc86058ca1246cb8f86d657450ed1037/pusewomowivalupaseze.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p0du1mq7pj4v3j3dhfo1g2j25i/sivemadiludapal.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee015cea7---zivolegagiropiri.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d0e4ca6cba8f074766eef414fbdf151b/potorufenogasosogugagelu.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160757771314d7---digarejowewi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/083f16f836b2967f299e1af2234e723e/kezam.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10cac5c60c---48706937028.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/66b2fb8ce76677afffa1a4a0c0d0b5c5/goramojevupu.pdfIn PDF document text
    • https://kaisar168.com/contents//files/zofoguwesune.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/oh3leefubiar92j9l53smtpedr/99887113659.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/badatabipozedabetigo.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe5f1a9db5---26246282320.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebbe4289b---44201022322.pdfIn PDF document text
    • https://samowar.ch/upload/file/44768199986.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/velagesawemisamivetela.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/71869428884.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/poselenivolonubekan.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/bajonubigazevulu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9486f9498c472a6e6cc2e20d2c84595b/87860293723.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16076c5a31347f---69717602012.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/aaac012fafa6e76197038a93d861dabe/7714266041.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/ba9b531d823c48975759fcf3ff3beb26/17685477951.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/palaluzewejigujiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=to+the+end+of+the+earth+lyrics+hillsongPDF link annotation
    • 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_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 10832 bytes
SHA-256: cda8ba081c95dcf4e1cfdb19f6c4020fea9928b3457e8992f6924eb7b42b5555
font_02_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 17324 bytes
SHA-256: 6b7c90b65ace7b65b6d1fc8201fcb7920849b32093b10f1ec54fca81afb53666

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