Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ae6acca17dadbe…

MALICIOUS

PDF

87.5 KB Created: 2021-09-08 08:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a86e254a87b8eff6e33ab5a33c3b81fb SHA-1: 4676b69e0f914e9970ed12119ca609530e2a1a21 SHA-256: f0ae6acca17dadbe49fdf6312b3c7a0585990fbd0d7c7dee3fe019f655fa8bc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating a strategy of using link farms on disposable or compromised hosting to obscure the final malicious destination. No scripts were extracted, but the overall structure points to a malicious PDF designed to lead users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=air+cooled+condensers+pdf PDF link annotation
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3fec2c49f24ba78f26149de2ee42c27e/19381951937.pdfIn PDF document text
    • http://showpelec.com/data/file/20210817_081506_177.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/dulod.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e72ca6b251---42202295692.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/timonaxun.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/15543990197.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c17ebe394---rijilaxebinubolud.pdfIn PDF document text
    • http://npas.ru/pic/file/85437510349.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/bokidapawaxafet.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/zexevujemitugi.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/gagigezeza.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120a6cd305e6---muferewasotedisudowe.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/17391809551.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/12419389313.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/9546940607.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d364840ee57---gater.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/dd1e4dcf45bd5c6e5d30ab8d368d16ab/57244205063.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/majivupode.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/45651185357.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/misuri.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/246qc3trqj7slfqv980jc8spv5/85712499944.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/98876051460.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be46ab5dc---gaderi.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/midenofosegeziver.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/46cit5beg3hce9j91ivs807ujq/57080918008.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_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 18204 bytes
SHA-256: dfeecf05bf7e4e6e329fea2f3ae10b2e61c957a5302674aa96f5eb7f8da72dc4
font_01_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 10336 bytes
SHA-256: 7af93c30a964218e6396fdb2c7ec1d2ad22a83bbd069c2e766f9e97da984ebe2
font_02_sfnt_off0001381b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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