Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde8f45d943e894a…

MALICIOUS

PDF

86.6 KB Created: 2021-07-06 14:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7792621a5fdf3c7a5f3cfc4638cce077 SHA-1: 4abdad9aa95c1887ad24535ba40b32bd1ccba8fc SHA-256: fde8f45d943e894afd1cd7c0c767893756a543fcabc5eb891fd48a3405d86597
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/j0t0gfgvcucft5g6886u0jqrf4/3049942667.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9ad34772---37064325014.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/74afb94bc2503b0cd7f0f8fc035584b6/45357107640.pdf
    • http://qca.ch/userfiles/file/nowaruvifewilelama.pdf
    • https://eminencesolutions.in/resources/userfiles/file/jojegiduberiv.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/31bbda66bc831a1d409e74ff9ae318c1/23634675315.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087eafab353e---95025243921.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6abacd1f0226dca89f4ca088ad81dee0/75040485508.pdf
    • http://mai-colle.jp/userfiles/file/fakotizepojo.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/c9aumsmqrg0060t9ept5uffham/91605108960.pdf
    • https://macauroommate.com/ckfinder/userfiles/files/farepazibojivulifewe.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/266e1bc0c6978d279b98574a1e59aaab/lafanemafaxemifaxatipi.pdf
    • https://bestofbucerias.com/upload/file/68580838205.pdf
    • https://dacinsara.ro/fckfiles/file/votigo.pdf
    • http://bright-inter.com/file_media/file_image/file/wabovusogamezirurezuni.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f2fd9473---ponulirilesilazokejanitas.pdf
    • https://skvely-kup.cz/files/file/pebowuxudabetawoxutomuna.pdf
    • http://capmar.eu/userfiles/file/wevazi.pdf
    • http://dambi.pl/userfiles/file/71573453950.pdf
    • http://chandigarhdatarecovery.com/files/file/37584357971.pdf
    • http://sugarfree-gelato.com/upload/file/jipafopogurozezomeze.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/95090158305.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/086262e4a9b790ff57f02f65faf31845/20783984721.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160947603442fc---90748460312.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989310953d6---tenezapito.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+royal+horseguards
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd4.bin
f78e8873538f38888b82ccd05d5a6e692f6c8d0fb2147e209177caa2af26dc0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 10412 bytes
font_01_sfnt_off00010562.bin
843a9a7f9f99f812c29fb202a60c929d898483939d40463c61d54cc29c073f77
pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 19168 bytes
font_02_sfnt_off000134fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134FB 16792 bytes