Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a6b7b897471f2b…

MALICIOUS

PDF

90.3 KB Created: 2021-09-23 09:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 427b8af9f5a2e3e491a1887e1e42ff60 SHA-1: 776df4bd70b22ca2e9e79fa651fe84a590208b81 SHA-256: b5a6b7b897471f2b5eb07964768ecb18b8808bb3d1305bf9ba45e6583d29f0cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://smidgel.ru/uplcv?utm_term=skyrim+how+to+feed+as+vampire PDF link annotation
    • http://parfumland.sk/upl/metilutopexi.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/25960923318.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409d566ccd9---14426673302.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/rsgh8969a62fnjuplk8ltc9e6d/57666011460.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/vajubumukon.pdfIn PDF document text
    • http://iphysiology.ru/upload/jewovizajamutisuregivuf.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/sifal.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/lavivaxabolekuliligezow.pdfIn PDF document text
    • https://scalping.ir/data/files/file/54690691049.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb14b5a8ee---79759249374.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/fofubinoxakawarabusemuju.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/kevifokemuworila.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/ragadetenizuxadalasi.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/83307770157.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/didigudoxonowawigij.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/um6shf3eldbrlqqd2eqf6u2k9d/lovugonedaboluvi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/50917ee49930b1a8148e2c5b94d4a23e/80705083629.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/dutiva.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1b063c41f---wirila.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/80778411687.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149b0f9aa953---xipak.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140f459ea575---jirewekexijigizikomunuw.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c18b22d23ad44ac99a36f41d617e7584/23659503999.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/3634088905.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109220234332743.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/08cb9da760fc9711cd277bc007f9c22b/71406614796.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_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 18956 bytes
SHA-256: e5e6ae17d09d18574770ee1b87bd7d98573879ab49d7c4c131ed2d7b1aef8cca
font_01_sfnt_off00012994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12994 11044 bytes
SHA-256: 7df4ba2a3f3b32e2db40bd04e632297022b6e648f0558d8b54b356662f7e106b
font_02_sfnt_off0001436e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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