Malicious PDF — malware analysis report

Static analysis result for SHA-256 474cf00d5dae941d…

MALICIOUS

PDF

98.1 KB Created: 2021-09-14 11:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 812a37e9ea4c22aece8daaae5540b354 SHA-1: 73fc61b4254314a9ab12b0b39b467e4d191d76d4 SHA-256: 474cf00d5dae941d7a650d114a7f155b87392ab21dfda376859458cde86d7941
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable domains or compromised CMS uploads. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a phone number. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 https://pixomot.ru/uplcv?utm_term=how+does+the+electric+telegraph+work PDF link annotation
    • http://kastely-vacduka.hu/fileok/file/febopat.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/25779569650.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/fixus.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210914_084752.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/lunolapekadukexojiduk.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134eed753de2---lejowusobo.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/patirogejivetuxefu.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/7750549396.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nemubimixitopakorif.pdfIn PDF document text
    • http://hkalc.com/userfiles/tejeparefibalejuridot.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/59603999059.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/jupatazaleli.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/8b2538df15b656fdcfc26a462b6ce5ab/23659870024.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/tavunim.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/49773676030.pdfIn PDF document text
    • http://youil.org/userData/board/file/tanelojajatasodaxojo.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/70748550862.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/pimebujefazerikar.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/22964812449.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090512465673499.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/demavisererubokoxusuloda.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7qm3moo3ivmmdcvddvdk1sc17c/dimofoxerijodofum.pdfIn PDF document text
    • http://gugugroup.com/userfiles/foleximojopokig.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/80027846368.pdfIn PDF document text
    • http://meta-min.com/files/newizatejizedaxodu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/79025440637.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_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 19144 bytes
SHA-256: 7f5752f8b0a6254a0226fd7f19abd7e82efef36db9d5b1f837cb77261e194913
font_01_sfnt_off0001498c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A3 10860 bytes
SHA-256: 5c43f45d45423d034362808d26d59f07648f6dd1e432ce10adc7d5fc6eac31ef

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