Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e2f9ced9a54f8e…

MALICIOUS

PDF

91.1 KB Created: 2021-08-16 17:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2133b262b8687264abc82a5f55838db1 SHA-1: fd8eb3d6ac1863f858cc919f632c5464d1fbbfaa SHA-256: 37e2f9ced9a54f8e64422bf4dfb177527d957315e09d1af8866cc7663d342d80
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://crysiq.ru/uplcv?utm_term=mohenjo+daro+full+movie+in+telugu+free+download PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/279330f745784a0a9bdc4896fea49e1f/rewepojogit.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/p1s4044fn317548enm088dg95v/61041802187.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/95b8046404908b829ee19d312f6d88f1/13239407927.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160fad9525b623---nuvanemawupod.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093e8be64d6b---rivawaserinetofuxuko.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/f60a6acad5aa3bc2802f947813194a33/povotazunarokuvebume.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/7l2ruo58tesbat3gf2jg5r5n2o/12526591420.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/firexozubanowotozono.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/93970756409.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1622666320.pdfIn PDF document text
    • http://markone-tools.com/upload/files/nexenuvebapovaduguvatile.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0jgh2u9kurt152tt9ij2jugrfo/sevapurikevowefafavoxoxiz.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160779d9f21e29---80923229030.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c401a30f963b8a9e5490f67ce690b3d8/kerawuguxogivexo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/o9ajqukabuj6o2umhgfak7d1oj/bexakitezimovoxolawa.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/hjc2lh7cv23lbbcv97o2dtdv0s/wotasuxe.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091e7aa73663---zituzezed.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2110b028ac---33727979420.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/68647893474.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/zobenilugigifebozap.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/62364297487.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe3fdd0c63---17663088921.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/16343d207bcb0b232482dfc18d774529/16019820255.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092c47cd0e38---bijifalogu.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/lolijesubofoz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000da70.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDA70 21704 bytes
SHA-256: 421795fcf93f99d875ab17d1772f677d02424368fd9f981b796b989a5d62786e
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 17528 bytes
SHA-256: 99603f457660211a54327052a0c0d5f0e0f02430b9dc5ea3def1c97b28053b02
font_03_sfnt_off0001450a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1450A 11008 bytes
SHA-256: dabf2d386f9e489d5203ef36c02486a67482159c285bd5884d58a2dc656330be

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