Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba8081b022820b1…

MALICIOUS

PDF

89.9 KB Created: 2021-07-31 14:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0014764433956e1110831065ad736546 SHA-1: f8c61eb4a12df903b36970327ebe9a5bb1955662 SHA-256: aba8081b022820b16505b51c40677cf1a969718205bd9b71fc182b6e5cbc5aa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The presence of these links suggests the document is intended to direct users to potentially malicious or deceptive content, possibly for phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://kelvista.lt/images/files/29692321436.pdf
    • http://www.bandungmesin.com/file/82651324666.pdf
    • http://yuhongzg.com/d/files/21970118743.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tn7c9uem3ft5keh6jlsichukq7/bivato.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/34572769364.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607270d523333---33723120091.pdf
    • http://malagi.pl/user-files/fck/file/99868019930.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f8519cc461c21731708fa89847a603b9/gifoxopijugipemati.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/r85o88og2jqsum116l4a3cg76b/papivamanovinirojutebinuj.pdf
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/59393409150.pdf
    • https://aradovan.com/userfiles/file/52984228949.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b90836bb4ad065d63d7c50e8e8611a64/mewomipugasonel.pdf
    • http://learningkey.org/userfiles/31354841499.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/67a8c83501b8a6d8c8b253af7b0abd5f/70085992560.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/631fc595be876689b14ae35a35cfc54f/77316778668.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf96a380cd---29311977284.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/87072660800.pdf
    • http://gaushalango.com/uploaded_files/userfiles/files/72077448422.pdf
    • http://bkht.vn/userfiles/file/78968899406.pdf
    • http://rolmech-strzelno.pl/Upload/file/37093219132.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55d100957---70750831748.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1660951420e3f8a604ab4e09d4735c0e/65607662164.pdf
    • http://vladjurnalist.ru/archive/file/gopubuteratomoratavi.pdf
    • https://champion-osk.pl/userfiles/file/9186539193.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083416445d0f---tinubezalikegidi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+turn+on+guided+access+on+iphone+11+pro+max
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 16792 bytes
font_01_sfnt_off00010fd1.bin
ddae218485ef4ed12bddc82b871aa1c1d582f629222f836a2172acd38cc99dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 11244 bytes
font_02_sfnt_off000129de.bin
7ffe902f8c5b57b4babc85ffaec447ad7a344927d5fb2f064bdba54b37abd4d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 18468 bytes