Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a4799b4960a52e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 05:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd5d14b594ce573dc51d72f558734467 SHA-1: 721b3904abbc324666307ae9810e6573805c5ac8 SHA-256: f3a4799b4960a52e7b863791ec06e954c03ab512b03ed7880533e1a747b43853
176 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and potentially containing a trojan. Heuristics indicate it functions as a link farm, directing users to various PDF files hosted on compromised or disposable domains. The document body, though heavily obfuscated, contains embedded URLs and is associated with a callback lure, suggesting an attempt to trick users into initiating contact for fraudulent purposes. No scripts were extracted, but the presence of embedded URLs and the phishing lure strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://marymo.ru/uploads/files/mugudodan.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3e7b2b54db2782951561a1a836b02739/gesatukezababujidumomudep.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/37489933130.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/93824259822.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/fopenunesiwasaduxida.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138e355179c9---jonujemodujejufanorof.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/18151645378.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/81348916144.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/34342896389.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/velawimexijesala.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/88861455621.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/zixififunemevezamotufekin.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/97346945229.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109201253082058.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f392991f76---kuzojilalubato.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/62453054576.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/muvupebibede.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/39903087368.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/30528106328.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/60761657691.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/44753989979.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/34884934234.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210921101928.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/rapoxazini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=strategic+marketing+notes+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_off0000bd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD63 11084 bytes
SHA-256: 2ff967528aca8619781297bb836c1f2f85b738da75608d76c42072db541a13a2
font_01_sfnt_off0000d6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 14976 bytes
SHA-256: 85a3a1f0f2107ec70e2b1f231d3a575821fcb983e3142a237fd62d3163a1fb3f

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