Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa34b338331f5ad…

MALICIOUS

PDF

92.7 KB Created: 2021-06-27 18:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61a0016668015a33cf70e2cfe7b9d79d SHA-1: a33c43cdf6ad7d7d2e5aef5d9cfbd2462e9baa89 SHA-256: 6aa34b338331f5ad26e2979f3d85e663804e45e90cc337e3117caac99eee160f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document's structure as a link farm suggests it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/cb7fe07a5f4aec7fcac3dd6a4ead1668/jezebobezamuzedadepisave.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f57c63498---lodejobenupidigubizux.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/jazul.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/t25m5tagmrl54bvq7shsqnmdvh/jofogowakezuwevuv.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c7292180---zilebozexavimigaguwutiwup.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/95081890859.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3a5fd0e2039e776f0e2bee1e703604b5/15742611842.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/000e35910dbb4a14a91c1c1ce9e5806b/kuzimafagodeduzotelaz.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa0f372a216---58992859078.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/37542704657.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2300da6be---15554356928.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c011b5cd080---gilase.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/gizibiwuvikuvefodinute.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/35630644594.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16087438a83929---26020153249.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ece9f7e7d3a11e1bb332b2ed0a9c357d/nifisoxasagurorakebab.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f407463f4---55989150503.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/gozon.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1901912806a8a6b381f1ce0099b9082a/9184403712.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hl4aesl03vgpr10262t1l1vr23/fariwuba.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/85a9f6f5973c417d6663bd5e9fb12ba8/pawefululusemujaledag.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22e2f5f5b3---xupumavu.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624057931.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b922c0526---gevazis.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/28212453068.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fefe224a4af35e81531fb68b7b34d6b6/84883843782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+be+better+in+pvp+minecraftPDF 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_off0001058a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058A 17932 bytes
SHA-256: 28d44fb54b68f4148e0f30f2bbee26107f64b555cbb4c7f7576056d7f5027322
font_01_sfnt_off000134f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 10708 bytes
SHA-256: e6c554ee03b8d68ed7bd505eb9d434beb8407fb488d38700c98e9ae1e3555257
font_02_sfnt_off00014d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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