Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f462c1ffd8d668d…

MALICIOUS

PDF

104.1 KB Created: 2021-08-20 15:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a3ae22bfa5c446a3591dadd4d99ecce SHA-1: 9407c79dc320c7181a0e3a342166884a2c23f2d7 SHA-256: 1f462c1ffd8d668da5448956662e69a9abe8324f4d03a71a3a793460aeb662e2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect the user to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick the user into making a phone call, a common tactic in tech-support scams and callback phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.stadion-zarya.ru/ckfinder/userfiles/files/kaduzal.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6baa7de2---10658256165.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af43de945cd---nejodogasekinovinazefom.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/cf5ca7bf19d6d6386af393c87da99df4/26724050382.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/tunulalekutidekevoluxubis.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/girumotazin.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091c83678e01---sezifuzi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608196b949e3e---xetibasafesixemisi.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/65579861751.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e953d2edd5---34636612638.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9bg1s6km4fs1b3k9vjqu23188p/57570535851.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/24450538663.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ioeoi23mn803iltqlkboja77v7/51129154865.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/5294074301.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/xenakelofuv.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/wuzojodiw.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/120a310f50a911be766f8e29c2bc19a4/noxazoxixugezekite.pdfIn PDF document text
    • http://sro52.ru/uploads/files/2834785794.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/53158734002.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/l7br7utn6hpfetrc7v7452ft37/45741156110.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/11957482160.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/dozukazepebuxasiki.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/sivekodasited.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6a3ad5be---58762352190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=google+contact+sync+apk+for+android+4.4+2PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 11304 bytes
SHA-256: f329e1a2b13c6062e275e64b738d72948fae3ab2b756182e18f6648b8ea241a2
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 30172 bytes
SHA-256: a284b4dd159a94c516a946b2970b32bab51d2c1c1a911d11ad544f4efbf30432
font_03_sfnt_off000162c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C8 17772 bytes
SHA-256: 1b51fa0c5b00967d9a770a37dde9c680e3f30c87fca265d5ce24e0029bca5547

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