Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a61c74dae3121a6…

MALICIOUS

PDF

76.1 KB Created: 2021-07-02 12:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4b5528d6f431ae5d5b1ca8e28b47d2d SHA-1: db4ac36d922c938a9f59b1cf740fd1540137a591 SHA-256: 4a61c74dae3121a641b75438f63d0182424316e864e3dfbe625d1fcd2f6f7642
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The structure suggests a link farm designed to obscure the final destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b5a6fa92---98555230155.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a0f0eab5---watewajazujapi.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a0899fc91fd46a41af2901db53c9046c/58524884690.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/llu8qns4dkmjmsjuqisagjdpr0/pigowagesaviwapom.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/7ab4c29e1adcc58f70ef2bfc0a91669d/13121892125.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160de9c94e7800---ruwiguwejuganamotugaga.pdf
    • http://handbook.hu/upload/page/file/gokizivarisuzigajimoguw.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/rp75ta4vu3q2pi2dtd7n6628p2/sokujilo.pdf
    • https://jotelek.hu/files/file/65659126882.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/8sjt5liqcee31bssvl74avigk6/saxeketajawi.pdf
    • http://sarlampa.ru/upload_picture/xutimesikibo.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac3c6a993---bewogetedamilodaf.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba0db4529---8187772083.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c73227eeaf---mawasukagutefigavemikitus.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8e5dc159---mifajasixowukifari.pdf
    • http://ranaghatpchsschool.org/userfiles/file/dezemimivanatax.pdf
    • https://thaiwoodengames.com/files/upload/files/fozozidotagumanike.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/63353140661.pdf
    • http://ashioke.com/images/library/File/koninisiwituxexazipijegap.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0dpg7gcf5dkdqdmi2vqj2dftf5/kosolikubaji.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/iklalroeeka5am09doputahr5j/53327213490.pdf
    • https://accu-split.com/userfiles/files/14726366609.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f127e404d4---robotemujozu.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16074549fa7d5b---basapej.pdf
    • http://oio.cn/uploadfiles/files/61458131081.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c695a3679---91679647681.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9f6b4318d---rifepeveneveg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+best+pdf+converter+to+word
    • 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_off0000c817.bin
fea50af5e03b951f84c3ffbea1807fd0ae1a65f9fd24bd38fa72bd85a7ff7f25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC817 10956 bytes
font_01_sfnt_off0000e148.bin
5a3de5168ffc3eb5b854ec10ef6b95664b12c22debfe40b0d17d192c3aa5de6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 15900 bytes
font_02_sfnt_off00010aa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 16792 bytes

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