Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bfa02604b9a0f7…

MALICIOUS

PDF

95.2 KB Created: 2021-07-01 11:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dfb85c05f232b49f32f5355834b624db SHA-1: 5b13604754208ab1da7925da863d9f25b46da81b SHA-256: 35bfa02604b9a0f75a8381e8703a839818823ba8d3d29edda713968f8b648970
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=nuance+pdf+download+trial PDF link annotation
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bevepokenerufurapuwubi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9a01c9cab25e7864c46bf2a7637ecfbd/49070843209.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/utivjkocmpei5mi9tfep32fb53/30846109827.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f02d208a---xusuredawusijojof.pdfIn PDF document text
    • http://yuha.be/_files/file/bosakezaretapu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/jc2htcfcrbgq9neb72sge94gim/28400079164.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/17421907533.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/genunagavafijaxerupup.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc5c30b60---14529439102.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ffe7fc43---50699402782.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///wizisojano.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/59490924592.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c261e11c380---55940995384.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093deccbcf62---ponexipof.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/91lspibs6uad2oti87euuem8tb/dojumadumafin.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa7170fab6---11821112424.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b71409f039e---vafapuwurafafujekoluravut.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba27e343fc.pdfIn PDF document text
    • http://thaide.org/userfiles/file/sisukezituza.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d400e2bb21a---77438284219.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4418d9742f11f77557b39f079b09f925/vujug.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce181a10feb---61805336200.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/616ee92e75f32fd6e75ea272c1982eec/fuvevalefi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/pfsk8miaq7aemilcrl6869q0bj/noponajubafafofilavigidi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 10608 bytes
SHA-256: a6c0fbdae621dfa81e660b248a6d88929c70720f4a1155bebffd7ecc012bf055
font_02_sfnt_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 17748 bytes
SHA-256: 769f7998b87d91e7532d25a88270f4f18d37fe5938f0313534a0c6c93f448449
font_03_sfnt_off000157af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AF 16252 bytes
SHA-256: 15510956be7ead9f824e209a6104b8be563ded270a313a9f6e525002084f8b58

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