Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5088e6dde0dddc…

MALICIOUS

PDF

94.0 KB Created: 2021-07-05 00:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6b94b95b61089c4a8d0db2be32edb4c SHA-1: 3f86aeff893436a93c8c2c5ec863cb35b68957ef SHA-256: 6f5088e6dde0dddcc7cd03f87d704dcda4dfb1e6c5c8bdc6f45af756262fea57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://smidgel.ru/uplcv?utm_term=are+mammals+cold+blooded+animals
    • http://ski-experience-japan.com/images/blog//file/47140308195.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/11121680788.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082715389ed9---94635945718.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/fea0a2909fdced229dd5c2ebfdb2939f/lemabopilatuvurek.pdf
    • http://gyobel.it/public/file/foxuligadeli.pdf
    • https://mangonebike.com/uploads/file/71629534165.pdf
    • http://akinmedikal.com/uploads/file/vulodevolukonoro.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b87c19cbc6---xuwube.pdf
    • http://yokohama-model.com/userfiles/files/90319233090.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/48e4e6123d8c025a8900f79ec1de7945/2641714805.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772360a789b---zalakofuxopovemovemaxutad.pdf
    • http://propellerclubsandiego.org/uploads/files/lifatugepigasozalozevale.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb89a510e---48009583486.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/57942880924.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/orusj3jbfed677dqghvkhr6lj5/14175410088.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a68d01afe4---22717817054.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/igr2nkma2istqbt12m131kt9ke/kiwuditefoxadi.pdf
    • http://kzlo.pl/fotki/fotki/file/ziwuraxubozatulodotidugax.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/67959174488.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/i2v94ujabihhv4erct4ilui6si/wezetodud.pdf
    • http://waelfawzy.com/userfiles/file/xerevevowud.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0906e3d40e---kejajowibozenujenif.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ab5ec11b---97013249468.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b621ba04b6209067d4e295710d24a89d/fiwanatebevuli.pdf
    • https://workinhotel.com/upload/fckfile/teposijojuguson.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e4d8efa6---4334305622.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001059f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 16792 bytes
font_01_sfnt_off00011db1.bin
3da753ef18618be7c50731e8217bdd8263dcc3911d16712fbf1117a2db1512fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 20348 bytes
font_02_sfnt_off00015294.bin
4c4a9f38e75d79f3fc3be9f816688f096d26e8f3acf8b0770b89be1321edda75
pdf-font-stream PDF embedded font (sfnt) at offset 0x15294 10552 bytes