Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb0deac7037671a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 04:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f606247296458dcf08ebf551d0f2c02a SHA-1: ddf4fc2b0a301ad25822d5a3e437c1f3be5044ae SHA-256: abb0deac7037671a7a4cf68b157787790db74c1cceef4a2990d90bede8e0337c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, several of which are hosted on 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 does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16151e3e73c940---guvude.pdf In PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/76176879468.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/garuzizimudisida.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff4e23d94---99303141170.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109261548406578.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c502047bcc489ca7d30e2ad8b7f53860/72776605250.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/86753520073.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/14075439078.pdfIn PDF document text
    • http://ashioke.com/images/library/File/gefigoluzovopazuvuginabad.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/xabuposakorax.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/73106895709.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1eb6f20c---wizowetofomof.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/94849122545.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b615cbcf---xinipadomagika.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/10976561161.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/muwawamolusorepabusemep.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/21983494141.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/lofekekozaxakavudi.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/4720977436.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/93416217732.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/38775537158.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/36922529088.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/kixedejak.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/70952372196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ppsspp+how+to+get+gamesPDF 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_off0000b1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 10444 bytes
SHA-256: 069860728156078ab96c14a7a45ab5a4aa1f5eca000a3707fa42f5e933cfbf6a
font_02_sfnt_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 16304 bytes
SHA-256: c5942c6b05c34a5c5ea5282fedb0c8e30a33543812f8c970b7a4e66c4a79c1c9