Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb401a0a4d1cc89…

MALICIOUS

PDF

110.3 KB Created: 2021-09-06 12:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2470f15ef7d92e4ad33b0e44be26017b SHA-1: 8740c42913e77afa2d472e99b9864a56451235a8 SHA-256: 1eb401a0a4d1cc89abe7192e1b7b5f06c7658bfe72cdbcd14393bdb09b6bb3ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=devasta%C3%A7%C3%A3o+do+cerrado+pdf PDF link annotation
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9c955c505b72d6589750dcdfb6a56ef/41949164353.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/pawapazi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fefc413730d---rizigu.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/f9d9e7a5effc637804a11b225928a25b.pdfIn PDF document text
    • https://chp-travel.ir/data/file/masumexatarinixifatebusa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160945245c80ea---83782451174.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/32971714367.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2da054a17696e5602b06b5c4abde0f81/runuwunedubarabimosekufa.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021591010124589.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/2uvbnd2okh4apfgksgqude00jo/81942343793.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608b591a08f1e---55924152214.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6094dc9c55---jewifa.pdfIn PDF document text
    • https://umartravel.com/files/99298865756.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079db5a5edef---10134833252.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/97848687510.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/fanef.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/8615143981.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/sowudovojumipimobipuk.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/87600261662.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8e442213700124f0b9d1a0dae1afc2ea/xigumi.pdfIn PDF document text
    • http://zzquansu.cn/d/files/nedalikorosopibo.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/nozusaseva.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1c0df941c9b047b708d00febdca4b28a/49183359107.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c32cd614b---59257472364.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/87590122626.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_off000143c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C7 10904 bytes
SHA-256: 08036c913aab936ae06a17192c28ee18fb4230463414461a9e079e5cdd2f593f
font_01_sfnt_off00015c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17484 21248 bytes
SHA-256: 63a4f7b3bac351507d90c9c93f02852eace5c09378dc5de3a216e690bce5ced9

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