Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfdc0e5b927727b…

MALICIOUS

PDF

68.4 KB Created: 2021-09-18 18:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eecf66eea393242349de732fd44b7421 SHA-1: 4f170c4368492382970682a59120cae24865a98c SHA-256: bbfdc0e5b927727b1746cac10d20f966153118646515da409410851c72d0cac6
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. Heuristics indicate it uses an image-only lure with clickable action triggers, typical of phishing attempts. The document contains a link farm pointing to compromised CMS upload storage, suggesting a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 68 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 https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/95a23b204b7d20545529ac6d46212504/23766574295.pdf
    • http://sahcarpets.com/userfiles/file/9936169436.pdf
    • https://pabxlg.com/userfiles/file/83666285342.pdf
    • http://abbeytraining.net/userfiles/file/43154986761.pdf
    • https://vespaclubcagliari.com/userfiles/file/17759696806.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lsu7a3unvadv003nh15l9ro6af/73493352388.pdf
    • http://pharmabiosolutions.com/filespath/files/20210908144606.pdf
    • http://maxidmum.com/images/upload/fck/file/govebetupubi.pdf
    • http://massintech.ru/img/outer/files/99899024845.pdf
    • https://greenways.at/userfiles/file/ravajosuvet.pdf
    • https://khachsan295doson.vn/namthuan/images/news/files/69113613759.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143af4c3bee3---80140581692.pdf
    • https://gad-elhak.com/userfiles/file/84003554825.pdf
    • http://driver-jazda.pl/upload/file/3078714627.pdf
    • https://securitydm.rs/slicice/file/66679956729.pdf
    • http://888chji.com/userfiles/files/ledejabixinasurenabaxix.pdf
    • https://aordonez.com/images/contenidos/files/22341931594.pdf
    • http://zjhywt.com/images/upload/File/36618908342.pdf
    • http://biogenetec.tw/image/files/20210906_165449.pdf
    • https://gemicilojistik.com/userfiles/upload/file/7850338536.pdf
    • http://aalzkj.love-mrt.com/upload/files/13142362280.pdf
    • https://il-gusto.com/images/file/69577920674.pdf
    • https://letajicikoberce.cz/userfiles/file/21979911733.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=melhores+simuladores+de+aviao+para+android
    • 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_off0000af58.bin
51c8d1e80a6d95bbcd99cb8e247d9906c65a9624aa4eb0a32df7b74f534c0d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF58 10716 bytes
font_01_sfnt_off0000c7c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 16792 bytes
font_02_sfnt_off0000dfd5.bin
647cda76803c139adbfdcd51b0ef6b8cd714147d1191ecfe235592ace98403d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 13852 bytes