Malicious PDF — malware analysis report

Static analysis result for SHA-256 5014135fd86586e9…

MALICIOUS

PDF

78.7 KB Created: 2021-06-30 01:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3aa49e62ff670010bd369720dc66d8ad SHA-1: 18e540fcb33fae28d917b898e464fa7d3ac4589c SHA-256: 5014135fd86586e988eadfbd5fd5c7f8aedb6f5e3fc4ee4a0bb1c917a051b2e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=distance+time+graph+for+a+body+at+rest PDF link annotation
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/0e779134be4d02b8255d63e257e5b565/funof.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/77630538053.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608222ee92752---dotuxanolobe.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/gigusuvujega.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/rdsbcdki8ujo75gnlbf8571coutlc1sf/pirixinezitunefaxe.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d663caa0---koseludowaze.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/kanulopiredalomaxukibubi.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/97ee220fd4faa38b5905b2a1eced8bee/44117760180.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16079792458ee6---42062832585.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/gilagajomiko.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/baa59def76ca83e9b22fcaf0739ee481/65082991751.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/58762956968.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/43038230388.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160967c7a597f4---lamowiponabebesoge.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/palazixupadelobubofuj.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609de2364d295---pevusipezelivono.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097739ddad56---20099495242.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/107a150ed9ee2d6fa7574b8e4d3c7cb8/lavujudejubezulefideso.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e27764b38---69251497214.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdd9f38298---62443920989.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/86564989753.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0d7ad74898c7ad5910c5e19d68b79dff/viriluwegudutomelajo.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/45578704741.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16240248281438724706.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_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 11276 bytes
SHA-256: ceb091bd50cf808b6972faa5700a20153886a48a2fb27c55fc67e7c578e21311
font_01_sfnt_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 16936 bytes
SHA-256: 131337d2392facacc920810b681d33c1952bc2fb679134d963ab1d572655dc15

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