Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa550a46f026214…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 14:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98e6ea9faf592e1e29897eaa0d0211c3 SHA-1: c2f28c35051e98f0eea7ec30b7a39c406c8ef3db SHA-256: 2aa550a46f02621424105c3b8d69ae098fc1c738d9a22a7a48d5e217f1978706
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving to obscure the malicious links.

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://marinaxaraes.com.br/ckfinder/userfiles/files/96733638927.pdf
    • http://ahlhy.com/uploads/file/091917481501.pdf
    • https://uniqrelation.com/userfiles/file/veloseluwudurabugap.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2711e7d0a94c2ce607e513c2cbc32413/vabakatav.pdf
    • http://phpirateboosters.com/clients/867602/File/vanafoman.pdf
    • http://anm-av.de/uploads/files/felopaxe.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/66314739640.pdf
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bibuledatemakamu.pdf
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/zeveniwabemoxobe.pdf
    • https://charterfori.ir/basefile/charterforiir/files/dosupanetusukejo.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/cd9698aa01677f35893e3a73ee9d1b6e/jowolikukabiju.pdf
    • http://findacommodity.com/upload/file/vakisakunufiboriz.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b06e47a44---muzifuno.pdf
    • http://baharev76.ru/userfiles/file/54432809242.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/53dfcdaf880900da922a63eb1c31b5fd/rekibezanem.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d490cd5482---zizupefigafedize.pdf
    • http://espacioschillout.es/images/admin/file/30968422933.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/va4ba19ed8jme7j8flvop90pn4/devefidodot.pdf
    • http://julianowka.pl/ckfinder/userfiles/files/firovezubakolega.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f0d89ffa16935fd3bc8abbffb4fb19a7/72247311041.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831b8b5127a---xidupebavujesiluzigimare.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gothic+architecture+history+pdf
    • 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_off0000d47e.bin
ed3afd6d0591e2a577c862044ead6856e66050a401361a1fc222558af45ae18c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 17584 bytes
font_01_sfnt_off00010244.bin
3c8d9227026c0a9c5dcaf715b56542a7f621fe61ec154cdf6452806cdf46c179
pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 10820 bytes
font_02_sfnt_off00011b77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B77 16792 bytes