Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a4055e3365d02c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 22:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 694e6ff999d0d6629a14e8de1bbd9b7e SHA-1: 086e1fb8a1eeb3b5fc7b84ec315ad440ac81c6e6 SHA-256: 35a4055e3365d02c853da4eaed77075e41d646e45a3fd61daa03fc2105dba2db
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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, reinforces the phishing or malware distribution intent.

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://infrive.ru/uplcv?utm_term=dragon+ball+tap+battle+mod+apk+download PDF link annotation
    • http://cpbnatation.fr/fckeditor/userfiles/file/mepazasakilagaj.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a295994d8a---34146876674.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210919184503.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/15072117468.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/55335220178.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/fagibupe.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/wexewani.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/64967689911.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/63ln979otmrelhn0hbn22o1rdd/fepuz.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/70967409145.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/44305653259.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/kirowaxovividifuxu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a7aa5c642332a76f36e9dfa4e93c0f06/pogujogib.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/latixibevuri.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f08daf3450---guxojupokisazutexatadeb.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/44840479077.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/8128066152.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/timagal.pdfIn PDF document text
    • https://binhvi.com/upload/files/pinejal.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/72883424357.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/71801655991.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/melirebipuvizaz.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210907131518.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/zazowarijeg.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/pipepo.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_off0000b405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB405 16240 bytes
SHA-256: 29d206ff412b08a20286efd73a59800b7a400e594027ce788a64e5080c1aecb9
font_01_sfnt_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 10792 bytes
SHA-256: 9b0457c9c2671dd5b2137041395df78c105961c681c663a2f96e72d49c632d54

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