Malicious PDF — malware analysis report

Static analysis result for SHA-256 af36a2a693630be5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 04:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9495ce598a62c6478c45b763623e2be SHA-1: c27ae21bb74bd5d56d0b92198c8ec6c7ffb1f68c SHA-256: af36a2a693630be5d260fe5fea8312bc93247e3c0e49672f70378203a8677d54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of these links and the overall detection indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=price+of+32+inch+led+tv+in+pakistan PDF link annotation
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/65427539869.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/20823711053.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad841d1fa9---23312993114.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/mawowulipuraxof.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/kadijarowigofenamadudu.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/76950216578.pdfIn PDF document text
    • http://lagrupacio.cat/file/35255036038.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/janagufiniponuwotemoj.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/49515031260.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/jomuwopovuxadi.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bedevirikojiduxok.pdfIn PDF document text
    • http://dnepropress.net/files/file/22196550533.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/37412869038.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/5273289715.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/nosidasolutijupazakefa.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/16070806249.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4acfbb26c8caf27eb30b7c890dcb9a7f/29161385584.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/dakumimumugu.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/5078702167.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/27052681909.pdfIn PDF document text
    • http://servmed.net/userfiles/file/metobuzomuvu.pdfIn PDF document text
    • http://markone-tools.com/upload/files/jexezapikefasipogon.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134932360e5d---10902068597.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0de99bc4f6ed6bdb9f0771e52e5eeda2/jisixosi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mui97uaqk1h3abgt4qivnf4d2i/41150348293.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_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 17864 bytes
SHA-256: f68e4657314029f9a417b1efc82d37999c42327ac2d023605c0c91a923c3466e
font_01_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 11168 bytes
SHA-256: c36e56c5183463120f202a23e7471c272493bc2c7439d79e9f7ef62d7921bb3e

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