Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bea801ea5ea5a8…

MALICIOUS

PDF

103.5 KB Created: 2021-08-16 03:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0bd0d996bf71527a1c3884ab9a9d29ca SHA-1: 3a1746bd3f507cc36b48e9d7d2c2167187e91db3 SHA-256: 31bea801ea5ea5a82b8ab69807b862fa99d2d4241828a328e5eb8fff7441f248
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of a fake CAPTCHA prompt indicates a social engineering attempt to deceive the user. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious content or download further payloads. No scripts were extracted, but the overall pattern suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=minecraft+cracked+accounts+pastebin PDF link annotation
    • https://gancza-yacht.pl/userfiles/file/sodosuguvidopefobo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609421ccd1c43---51322465401.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6f537c931---85087480500.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0c5b40f14---64685411365.pdfIn PDF document text
    • http://nemalipics.com/junabetudetabi.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/10333746677.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/fidaruzew.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/sf87ijnpsbc8mfd3bham2bvm3m/71352495521.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/12896388791563cd06d0ec540846c6aa/golosuwatifofarulimuj.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/44924328270.pdfIn PDF document text
    • https://menu2uplus.com/images/file/jesinimabad.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/96566529896.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9eb6098bc98d87b8a97163b2c125d84c/zijobimataxoxutakudona.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/kujovuwogewejojifo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719ef863571---rixil.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9187a7e912---43121173284.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/popizibifagufuma.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b752c9a6b---zugavozidusopaw.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202108151009184049.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/lewejapone.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096af782f7fc---25575505467.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/joliriluragax.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11df9aebb---3536137975.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b1744c9c---37409634283.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 21048 bytes
SHA-256: 8b7dddff2b41fb9ae44987dbe14ee44fb1bf472fdad928814f574f8d01a04f5d
font_01_sfnt_off00014a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001628e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628E 5172 bytes
SHA-256: 811e4c44c2255325bcd050d63511645e58819abad5a4b3cf665694496592f96c
font_03_sfnt_off0001754d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1754D 10892 bytes
SHA-256: 4be06302dc6c2d865577ab783cfd4c83b84881094ade01060f9035810396af03

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