Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4509f5c4c27f392…

MALICIOUS

PDF

161.4 KB Created: 2021-06-28 12:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59de8f9f8396c94ca27ee43e62aece34 SHA-1: 0afd9f1e88a79351a77ec9d15a2c737dd82fb4f8 SHA-256: d4509f5c4c27f392b9557a3a324f5ce113b3fcb0bc959f4c07a97500c0ed086c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. The presence of numerous links on disposable or compromised hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/082d1669965f20f32d015a10a22d874d/jiwezexeku.pdf In PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160947582d1fd9---dapelikul.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c151209d45---mexuwexekit.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/bvted10v8pi2j16f1gj7nco8dg/xawupotavobusidazivinug.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/momilabaluwegigewoxed.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/zinupumizofajotab.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088058560c3a---36479285105.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072673556ef5---51448443935.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160764bb4c91a4---vasozotu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44c5a95d27---14936586990.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/22992235431.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210510/file/80990374034.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4322eme5fb8234e4ib6uqj0u67/rekawofokufizizexenasepi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/47e88bad73f1346353672d36d0cf3c1b/duponoderakugonapidipe.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a39859217---xumexibowudevux.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e01c5de2d7db95e2d51b53af9cd2500e/leraloboxujima.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/lavidimemimat.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/wavololajome.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/er7b0e56rhjarvk9luag2in7f3/28241697303.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098428e09971---ralutikunufenixarovaf.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/53124525002.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c454aee3899---75977411941.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/5265388206.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/82338350654.pdfIn PDF document text
    • https://strechybenesov.cz/content/50260938404.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ub8gqa4m6qdh2se69s37rkdni5/40687060585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=building+personal+resiliencePDF 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_off000215f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215F1 10744 bytes
SHA-256: 4fbf8cc5696dd84544e34d89b6edad7066c2a1abdcb9d645887bb890b7280dfb
font_01_sfnt_off00022e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E7F 19184 bytes
SHA-256: 267df59421bb32eebc20e9ddedc683e2391d64136c74f45843ae42aa4e5dcf57
font_02_sfnt_off00025ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1