Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ce381b78841955…

MALICIOUS

PDF

94.1 KB Created: 2021-09-08 07:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14e7c7d2cda8ab34c26a3d660b8eeeb3 SHA-1: e2f8c931acec331499ba0c8f22f031064308dc03 SHA-256: 76ce381b788419553c967e7898a28db20c873d2f24e9742cbc3d92d7bdcaa1c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/612b4659312a41c3758682724f08e7f5/poxer.pdf In PDF document text
    • https://acryl-bg.com/userfiles/file/16189551713.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611310440c157---95630803316.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/93833047006.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/zemonemiminobibe.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/45522241436.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/98245772396.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089215e0b482---46819082367.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2663e120e1---zaduwanuvimovelazidopu.pdfIn PDF document text
    • https://protrialse.eu/files/files/47663840853.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/u3sbtn4gd4tab7g720qlgbg1q5/pejakowukofemojezutebazu.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/bemowomomimuzitupiduba.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/378444137.pdfIn PDF document text
    • http://malifer.hu/upload/file/30845256867.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/r785ie4oifhuhsqa2mqb0udb3e/foponudajugekiwo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9c806026---jatijenodakafalanidazopa.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/kirilovete.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079861775c2f---tegopedudedesajetilupop.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/db0cbceb97724705241acc9930b5170d/48321380569.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/8826410386.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/41957050889.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/ratijulilugazoxesiderij.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e639cc9ffa00463d5b259c8e4c01c053/54359865337.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/wujopirif.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/57128346362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=international+business+law+pdf+downloadPDF 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_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 10768 bytes
SHA-256: ac0915f6d30cea0c2d3dbe9869294178a31151cc98aa4a56b92e024be91e55b6
font_02_sfnt_off00013a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A26 18712 bytes
SHA-256: 5b1c463d545c45d4ffc45345c670675b8ce3d0766a9eaa0f7d801865d876fbbc

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