Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ae4f79493f2626…

MALICIOUS

PDF

75.9 KB Created: 2021-09-09 00:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c66852a45dcb7961a57e316983e6b2d SHA-1: 0d5d6129a7d122f41306f9e57d57a6c187d462ab SHA-256: b4ae4f79493f2626a6eebccbdbd67448fb70fc5ff3a2cd280fa31347eb074d38
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to lure users to external resources, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://ls-machinery.com/uploadpic/files/202109061533374342.pdf In PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/65465740587.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/gokalef.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/62671252853.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139267585ac2---23984792744.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/20267862245.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138be35043fe---lakinuwivimumer.pdfIn PDF document text
    • http://chinalabware.ru/d/files/77145322038.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bbbe17b3---xitimadagira.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/61611688347.pdfIn PDF document text
    • https://istanajp.net/contents/files/25883039364.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/8790921760.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a0ee72fa0---rulekaruxakotutotesigu.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/lelukojejifozedewijubu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r2ufvcdrhprkm8g9h1u4smb82t/98486721600.pdfIn PDF document text
    • http://citty.org/images/uploads/file/18146702274.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/rabasojanalanu.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/17737772013.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/31544887305.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/82651709881.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/59931504576.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/56416313098.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161326410a9cc1---rinemekosevusezafuvol.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/91415174944.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/rilusokadolisuv.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/sevabepumuwagegepab.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/boneloxetokuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=iphone+x+vs+note+8PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 19160 bytes
SHA-256: 413eb4bff8d1cfcd1fb2bd8dd771ff314e848ced2d8f35e7a625139b1b1c5c6f
font_02_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 1712 bytes
SHA-256: 631ca8c84f01fc1f591e278f46ffe5b63467985ac0bd5d939c135cf401a2b01d
font_03_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 10276 bytes
SHA-256: 4442a575a06178b05d914ad78aeac427ad1a65e91db813667fd9021401df6565

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