Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5249abffce811a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-11 17:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb4af3e394b85fec7aa2cb7b215c7b0d SHA-1: 37e3c351c4a7c01ec35732f22ad08250b0c0e81e SHA-256: 3d5249abffce811a4179d6ddae6a63c6e9312f25772bd0f0de77c1efa3b6f1ec
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 links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=die+besten+android+spiele+kostenpflichtig PDF link annotation
    • https://nstoplana.rs/ckfinder/userfiles/files/6105918561.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/mivonijoxe.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/69883725938.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/lofevupanakadipaxaluloku.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/tujidapojeb.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/ziwepugisisugimomegejo.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/bitudo.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/37750385065.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/40340189590.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/33081554311.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/83295131564.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/fewevidanogesisewonilizir.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/dapewegos.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c1df22a61addbd6c04a65f6eee2bd72c/80348599508.pdfIn PDF document text
    • http://metabolit.ru/files/file/57082384864.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/57863918249.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161351245bf984---lematimozitipijif.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/miroduxawiwupagi.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/kuwisuzaxakutanu.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/boxatesapopusewikufojaku.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/nedew.pdfIn PDF document text
    • http://hidropro.hu/upload/37522950453.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134afdb0cda3---vowod.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/lamedilenokovibag.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1728c598---65317620778.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_off0000c0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FD 17232 bytes
SHA-256: 80c57cedd4b88fff3fe99d90dc3225f1e03ff8b1b989c3b04e2c4a17b0ff5f75
font_01_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 11132 bytes
SHA-256: fe41e3406cef61bad407df56518adf55458cfe80654d5655d13c02846f112d06

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