Malicious PDF — malware analysis report

Static analysis result for SHA-256 be34f3f1d1c9be9b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 14:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 111d9f08937925ea1cd93fca30d8bb56 SHA-1: 84a7510ecfde01adfb7ac2f44a66108d5f2ad9de SHA-256: be34f3f1d1c9be9b94dd336b8e11be45f43be29f137aa447fa503012d8ef1fdb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://abwingscolley.com/uploads/files/nigozugexavijitesujojusi.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446aa5474e3---24176624539.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/40080111256.pdfIn PDF document text
    • http://baoveantam.org/upload/files/84769841806.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/64054137366.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/vejonikexafajaminosu.pdfIn PDF document text
    • https://oferta.lt/i/File/zujoxim.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/bodubavamuba.pdfIn PDF document text
    • http://pk.mo/userfiles/file/81976680799.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/davozamixerekixafap.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/ninawezafulikibofan.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/92522321398.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/zufus.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/97582026211.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/zevezetukiwiz.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/modezumiv.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/lodl5p3erdett3mgoen0enuubt/lekafujagolikubixik.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/murabopidatal.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/josinedowibedajivezusoro.pdfIn PDF document text
    • http://synphabase.ch/upload/file/99900214802.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416c5793992---siwul.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/20824048458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sniper+3d+mod+apk+new+versionPDF 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_off0000c783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 20388 bytes
SHA-256: 3c5e5b772671609b006d4fac6579420cefdde80a32352a9e2a0593d583cc5150
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 10900 bytes
SHA-256: 77447c101bd9d4037c076c194b85fefb707da091670ce364404cc9f92d6d7079
font_02_sfnt_off00011695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1