Malicious PDF — malware analysis report

Static analysis result for SHA-256 97414b43a09ba374…

MALICIOUS

PDF

76.7 KB Created: 2021-09-03 07:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2d978e396a2db1f6efdfab30ea691a7c SHA-1: 668d5d3cd5556284e6dca419d6d207bf89bf1a01 SHA-256: 97414b43a09ba3746caa75b6e82d8108bfd64a4a6381bd46535b7eecb3fe36e2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains. The presence of multiple links to compromised WordPress upload directories suggests an attempt to distribute further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://conrays.ru/f/data/65176455266.pdf In PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c02af9cc8d---99325194702.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/38443824185.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/27129467432.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b88f9e5758---29541415535.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/sazakuwopitov.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e12d3ceab---88209862774.pdfIn PDF document text
    • https://aksusu.com/upload/files/99356085741.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/81756310147.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ecc89a930---jigoponagusezebuzebapebi.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/gukot.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9c1b4676---mekomunowakivutixib.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/masijitezofipofifozu.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/61170175730.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/f6768c46f5a67e7f7bf37ce18a7b107a/5722551113.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1cae6b44ff---16239545117.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10fed329c---12739509196.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/vimoxiwetitederodozaren.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jkrcvfueqp1t41s7h135nsut67/12762226460.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/8184638210.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4c61b10ad---noxofodevazosukud.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b455cda0107---zejefufugelifi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b0cc7eaf---tuzaderomelififedavejatim.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/lagupixir.pdfIn PDF document text
    • https://etimes.mn/uploads/files/58273064672.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7cc6410e36ccafc00df496a7a64efea0/litefejejabewexaman.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210718112426_46f2r1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pengertian+hakikat+manusia+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 10972 bytes
SHA-256: 1b43da26fe35246c128c7eab4bfdf2cbeff3a3ddd87fb1ba8549290c14852f6e
font_02_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 17224 bytes
SHA-256: 90c42d0d27957e96f1db91820d96ae3c7aedef4d6e421d2af366808d0b028a27

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