Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0620cbf4e46f375…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 22:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ce31b59224332654310a3d482fecb29 SHA-1: 2f49cb200653b92434887ccb51646c2e7cac04ad SHA-256: c0620cbf4e46f3750b13236cecf5e77f95d22dbea8c32663f5dce6ce59731515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other domains, likely serving as a distribution point for further malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://centrlita.ru/archive/image/file/fajavusufosa.pdf In PDF document text
    • http://veraschwemmle.de/fckdata/file/83413710025.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/7683166366.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/reberekukubesulij.pdfIn PDF document text
    • http://apcmagon.com/userfiles/xeruxegavitivasuneno.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/fugowijuva.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/51885122632.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/15449187437.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/faxerevox.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/tuditepilamiwivupafipowig.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/7930989628.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/93617098141.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b52a99d38---63154996507.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/96183289202.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ojan3ae1fh8n5uvjtaeiag9pf0/rebibigoguxi.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/sunabikatexilewasiram.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/90039484201.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/wemapo.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/botimafad.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/fogokaju.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/20206047017.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/24848694907.pdfIn PDF document text
    • http://marketingnews.fr/images/file/lufuxaletej.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8650dbf5---moribowekegexaluzawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+best+apps+for+firestickPDF 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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 17892 bytes
SHA-256: ac96c9a6cefb6ea12428db90eb979cba67eca4ac821ab19902f94c675b85d220
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 10624 bytes
SHA-256: d480c61f0176501a56e65b067ae165a9fe0ccdcc57181678932a02b0f69d2f82
font_02_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1