Malicious PDF — malware analysis report

Static analysis result for SHA-256 a432909e5ac3b064…

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 23:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2385fefe4a297e1db6f761ac73d78241 SHA-1: 9b7eae873750d608575a50aa9c23e939949349c1 SHA-256: a432909e5ac3b064a4e645e393f5f95bafc425c938e9bd7694a3863eb8db04b3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to compromised websites, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates the document may attempt to trick users into calling a fraudulent support number. No scripts were extracted, but the overall structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3b7199ae---xojuvotufaludimunidule.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28f1931819---zapolavuzazudanoxetukavef.pdfIn PDF document text
    • https://aedwea.com/upload/foto/63022611450.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/90309025155.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607019018daae---85358450076.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/72242649646.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/sovovix.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/96955109514.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/26643090471.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/r66jop8plj90jfg0hck3eme7s5/7199890353.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/fjj56utm0fk5l3uc14neip8d92/55844810102.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/44926781351.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/kevatekexadisute.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/kuwivoxudapu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/dabesa.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/94301702696.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/dinezopo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609588a1d95a3---49594877703.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/xaziberurikeno.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/o9h1uac776blcfqdd4vg4lkkh7/nekofimidikerev.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ban5g34upvq48pvu3rnbq06suf/zawonovedefokaduzidofi.pdfIn PDF document text
    • https://anup.bo/images/files/ledokomifoledumanod.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/oe8ppp6b8jokbq7fgocgafenad/ranejigukamufarova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=educational+psychology+theories+and+applications+for+learning+and+teaching+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_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 17700 bytes
SHA-256: 9b9448b605929ee80acc991f070197c30da4515d4388648c024c42dbc036ac27
font_02_sfnt_off0001340d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340D 11096 bytes
SHA-256: b27bc57ae698c30bdba7d8e1f78626fe6d4d8b19e21d6b08509f653b57fe6783

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