Malicious PDF — malware analysis report

Static analysis result for SHA-256 b502993739ceaa71…

MALICIOUS

PDF

89.4 KB Created: 2021-09-16 20:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13726426da128ea4741b704465139f62 SHA-1: fbe817c4ab9e70d65363c0604dd2856dc315abc4 SHA-256: b502993739ceaa7133fb2bd35562a89fa819dac39e7132a7a888f473d94b6993
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as phishing malware by ClamAV. The document contains numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tomaszfilipczak.pl/userfiles/file/lotoxedudonut.pdf In PDF document text
    • http://kiuanai.com/userfiles/file/bomiregexira.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/vebirutobul.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/vesusepakekapulivu.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/vakiwusule.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631548637.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130539b66c48---64768948731.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bfc6544fbbdbcfc5acd372cd14b8626c/bivawexutobafurabeb.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/nadej.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/bomuxamavisef.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/4832395078.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/xesudubusagowor.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336bebe0809---54240364833.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76041846355.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614368ce76b31---tebexawijuwovegudutiji.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/39323180166.pdfIn PDF document text
    • https://edarky.net/data/file/dezatifolafabejeramakuna.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/45095158626.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/nurul.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/kopup.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374450babed---tidevozolevurisara.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132710d2833f---42900736081.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/wixawulovakinas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+studio+call+logPDF 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://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_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 18636 bytes
SHA-256: 3dc9cf5abc4053040bf38ca82f36ddcbf2389cd0f532420e69e9c991d58d863d
font_01_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 10492 bytes
SHA-256: f0ac27ab2b04f0642496abc2abcca0301614e2a8dad0709a8d3d3846a80efa57
font_02_sfnt_off00014069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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