Malicious PDF — malware analysis report

Static analysis result for SHA-256 161aa1f67ffbf7d3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 13:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d6b4476c60ea69ac48f70cb6fa52009 SHA-1: 3f2c91284cb0e04d1c6f4e790b4580c951470aa1 SHA-256: 161aa1f67ffbf7d3cf0802d6cd14dd3c235e7729e75d6f398019925e1bcc6748
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous unknown URLs point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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 http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5d7tmfs87n58ni2qep7hmg2h6a/guxerafi.pdf In PDF document text
    • http://nikkenj.com/userfiles/file/dogafibiwazemujuw.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/maragujupugil.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/41286441778.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/14027891896.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/709329638cbe2460ec0cb9fca510135a/49427484930.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tftemf1akntodvm8el4mk8dtf5/68488517575.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/xonuvimawepawuzona.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf4d15c84e---97190218613.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210508112336.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/oi17am23dt2lncbk1uurqmd086/rofagidadixo.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/45274946214.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/41334771696.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/r907f4hd3l5ee7pp0k7tmvkiiv/40598155807.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/49547168186.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/sazadafel.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6c1od6jkkvtp50nsjuntoirosc/foneguvabofelo.pdfIn PDF document text
    • http://msiutilities.biz/documents/48859876756.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6df3fe7b92f2f81582137129693642ea/2281496277.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f49ed43b2---tuxiwoziwedutogifes.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/rukugositevu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/lukivojowefa.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/mnqfhkijri6fn5vjflaeur3dc0/fezepesivutemad.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/xipeboge.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1d04e68e---53297310742.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c43e2da6811---rinagavexenabanewusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=god+created+the+integers+stephen+hawking+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 18600 bytes
SHA-256: 60d1522419a878dc36322e1430dbc3eef65095997447639cb6213142b47e7411
font_01_sfnt_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A48 11068 bytes
SHA-256: 5a96186639c835104956661a96a77a89187a096b7efd8a1c61d1e8794378902e

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