Malicious PDF — malware analysis report

Static analysis result for SHA-256 2280d4411cb1c427…

MALICIOUS

PDF

101.0 KB Created: 2021-09-01 14:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4bf028dff50c4839799c093a2e66730 SHA-1: 3b3c40a26dddf0c7d9a19734a7f15cc670e6e34b SHA-256: 2280d4411cb1c4279b770ae05a169e99845a6939759992c250d95536189f7ce4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm for SEO manipulation or phishing. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing and tech-support scams. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://n-zvuk.ru/upload/file/58413399416.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba1d6097816f3d6eebf7f5ee4217dbde/gipamojawanif.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/16979977247.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/puvuxaz.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/vekavopagulu.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/25147012002.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a86434d372b---rijizupajot.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/75664367505.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4803378364a667763221b0fbe2f7ab26/bagajapof.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/77d4f98d8682c5edbd40e861f946b32b/62866870144.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/21868304047.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/wedadomugigibi.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052506271334.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/67721357361.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/22a3dfad24c9c3f786189b4054f015dc/69404040223.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/5295232155.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e64687a4a54---45456012829.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/89321634171.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/48385387660.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae69a3c04d3---98176959142.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bad2532b6---tomimozilirolaratujebutaw.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/31210960726.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/67420102388.pdfIn PDF document text
    • http://abnicum.com/files/file/fevogoviwaguvudufivige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=experiments+from+lilo+%26+stitchPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/26998260890.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_off000125c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDA 10440 bytes
SHA-256: e5437ac484c067dd8d225396df5b78317e88468b7d626efdbef43b08ec0b4f53
font_02_sfnt_off00015581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15581 18704 bytes
SHA-256: d070e162fbe38a2f06b538ab6610685ff4c8756e4ebf941dcc993dffe19a90b4

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