Malicious PDF — malware analysis report

Static analysis result for SHA-256 be990233a3ea76b2…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 13:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1a1690fdbee4809424c6e45f4f239829 SHA-1: bd6cb90048dad0cdfe6e8d61c48f90edd9c088dd SHA-256: be990233a3ea76b2a3cfe533eedcf28b6e148d2c92a5a230cf6a930819c05062
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple links to external sites, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting it's part of a phishing or scam campaign. The heuristic 'SE_CALLBACK_LURE' specifically indicates a callback phishing phone lure, consistent with the overall pattern of malicious PDFs designed to trick users into contacting fraudulent support or billing services. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/54180386121.pdf In PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210908_FF4944CAF9735085.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/5145784226.pdfIn PDF document text
    • http://kechengchem.com/upload/files/65588124073.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/1373549471.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/65862804685.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/37676286732.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/50579130226.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/21143809413.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/51159743179.pdfIn PDF document text
    • https://cargobull.cz/res/file/21244472977.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fanifatikebigisepopesobel.pdfIn PDF document text
    • https://codecs.ro/images/file/zotuk.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/16568299394.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/lulifijenorowifozefag.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/fuvojugodupewowizidoponat.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/47120786128.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/wewotadelovifugiloresi.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5446d229---37418535971.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/loxesimetudiwe.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613161bc44d9a---tamesizuvadus.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/jiguresotene.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/zezojewisabikesogut.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/110abac75adf30e80fe61b8360ee41d9/55740878546.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/suseworisejuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=personal+pronouns+and+possessive+determiners+exercises+pdfPDF 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_off0000cb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 17072 bytes
SHA-256: b5c5fa2b33eef6b1eddb93026edf5d778bee68b54b74b2029287ff59cec59afc
font_01_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 11052 bytes
SHA-256: 4eaebc4501397c3292af8b90457ded6d9c29123cf8d81e0a7f3e433d40d4e220

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