Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c297b4e6163dc9d…

MALICIOUS

PDF

77.1 KB Created: 2021-08-05 08:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5f3d741d5cd4d68af89d5d7127004032 SHA-1: 9c44c9a9758303ed03986b1f21aff2ce5f7a8b9c SHA-256: 1c297b4e6163dc9df4d606519d7e84b0d82dba1e4477b1bd0550efb0cd6e6e3a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and links to compromised WordPress uploads, indicating it functions as a link farm designed to redirect users to malicious sites. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/uplcv?utm_term=ain%27t+no+sunshine+lyrics+pdf PDF link annotation
    • https://karpzbeldowa.pl/uploads/userfiles/files/fudevigeguvupevavugogi.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/64912391968.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9i2vujf8flg304ot0ng69ubpcj/kopidewo.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/dugopomelezufarisatasigal.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/riwodoxepud.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/50a06551b4f8ba2ede8e5eb07e1f0ca0/12870585548.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/10620738139.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/48arb2up9slil19f5ilh8kvv34/22933758812.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4437b9f96---pafudobuzegevasevemenil.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/31682944611.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958f6ea6802---ruwemagop.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b79c647a438---sofebufigaselemowud.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/27053118433.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/93447973608.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/vukope.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/kenokowarufesamerokewu.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/08f0a3e24b6a0ca1ac5f9b5edf35f4b7/86177115073.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/45114761044.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2dd6a0b8d0f7dff896c3d0f35e9f314a/jobelalewumiwamav.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/83346369493.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a3fc29c7206eaebc779a691221bea13/kotegutin.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/48231773178.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/770006b622a7954e1351df135500d747/motaxugonudo.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/kogoxewakilajoduzujokopes.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 16228 bytes
SHA-256: 0c96660d881a3cc46d997c41f84d7783cce6a02f54b4647c8c01fee41947c541
font_02_sfnt_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 10784 bytes
SHA-256: afd73cf3c36bbbfc5f29ce411434f4a8afd249d042fbc89ffbd75659c05caa83

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