Malicious PDF — malware analysis report

Static analysis result for SHA-256 11706bf134d531f7…

MALICIOUS

PDF

67.7 KB Created: 2021-09-09 21:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1903791bd76dbeba32dd2d260bf3b5ca SHA-1: 6a4c3c1e8b749b0a6427fa92bcb64ab290307686 SHA-256: 11706bf134d531f753f76aad1303bf37d35b04f9753aa2b07bf5233c9329bf7e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and a clickable action directing to a suspicious URL. Multiple heuristics indicate links to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware. The ML classifier and ClamAV detection further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://elesi.eu/fichiers/files/jurozavomer.pdf
    • https://liantoong.com/archive/upload/files/1996992532.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/fetevadabegosof.pdf
    • https://ikorti-iao.com/userfiles/files/lukakajowet.pdf
    • https://ibeguiristain.com/userfiles/files/nituragakaxe.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/segilalat.pdf
    • https://sweetburden.com/upload/users/files/6920556450.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392cde5a4a7---bevikozusenajimude.pdf
    • http://arci-mp.fr/admin/File/1075165549.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1a6cd1a491d1bf6fc326c424f2b206ca/30875600791.pdf
    • https://aashianarealty.com/file/58730477827.pdf
    • https://khangle.vn/uploads/images/files/gejim.pdf
    • http://citescolairedeledit.com/include/file/98572338934.pdf
    • http://scpt.it/userfiles/files/jewepewi.pdf
    • https://krzczonowice.pl/gfx/file/58401760658.pdf
    • http://contelex.it/userfiles/files/sunupim.pdf
    • http://smeeing.com/userfiles/files/mafafofa.pdf
    • http://neza.cz/UserFiles/File/98737813196.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/97563472028.pdf
    • http://31kouqiang.com/userfiles/file/1630528304.pdf
    • http://zehanbiopharma.com/upload/files/zajukugoxajoz.pdf
    • https://toolsatool.com/userfiles/files/17250938845.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/katokazawid.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133244130927---74976478498.pdf
    • http://asu78.ru/userfiles/file/zifojabetekenivo.pdf
    • http://kocavietnam.com/upload/files/takatapilawun.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tower+defense+io
    • 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_off0000b04f.bin
171e726a6ea5d41377e3e06d42774c9ea18d6273ce65840535a9dd424d353533
pdf-font-stream PDF embedded font (sfnt) at offset 0xB04F 10092 bytes
font_01_sfnt_off0000c6f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F7 16792 bytes
font_02_sfnt_off0000df09.bin
07f1c0542ba34ae1c3b6d425818bd9f0ffc45adbf4ff412f8d37f99a0830fbb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 14052 bytes