Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dae80b6b18b7c93…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 13:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 92435204b9bc750be45e019961b8177d SHA-1: 2c837ea66b6cace7ff8578b94de62fc8721338ff SHA-256: 4dae80b6b18b7c932652e12c4772605c7b0ec46d895547f10aceff1734f4b49b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the primary attack pattern involves social engineering through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bamor.org/userfiles/file/fawitasugobip.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ibrud7tsetvvk07at01j4dbdk4/45512030488.pdfIn PDF document text
    • http://yuha.be/_files/file/50227317631.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/sexokixeraba.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2392767530.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609231ea3b6bc---786757580.pdfIn PDF document text
    • https://kristinanamaste.eu/files/90200934365.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e839b1ba5---45261940097.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/13cdkdnkp8kdbamqmtd364g1c5/kijexejiw.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/nawokemekewiduvosokale.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/52479191699.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/64953524050.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/repiwojojexuposip.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/31119874836.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/47292231153.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/12981010528.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57a29a0f9e---79653222897.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/r9n5g1la028mh7eji1romlcbvv/wepozalotumutukagomax.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/601ea852dc94346f2bacb8de34ea7f96/kutadu.pdfIn PDF document text
    • https://kham.vn/userfiles/file/lofiti.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/risakesegajovit.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f7cb8e93a---88269563421.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/28545279092.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b768acced9---96708639516.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/49406965221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=microalgae+biotechnology+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_off0000b709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB709 14588 bytes
SHA-256: 89bddcbfefec60a511ecd8e3f9e473d921f9737f2b0db069511d29ec33172778
font_01_sfnt_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 10976 bytes
SHA-256: 07e855c68089f1c23664ec74dc0a14e6143ee440099e790bb443d0167f3cd1df
font_02_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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