Malicious PDF — malware analysis report

Static analysis result for SHA-256 a104e8a820ea7493…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 04:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f2ab76c9a47ba86c00203a3be004a15 SHA-1: a6adccaad018d21db2e34fdb244a6f4bb1acd251 SHA-256: a104e8a820ea749390cce74a45e1c0ecbffd1d242dc23373082a01bae0db7ca3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous URLs pointing to other PDF files, many hosted on compromised CMS uploads, suggesting a distribution mechanism for further malicious content. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ni4turocui85nm8h0grmgp79q2/vojureg.pdf In PDF document text
    • https://wagaskar.com/media/ritunemajovuf.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/feba77de515a09ff974c61350019d2b3/35772095694.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/nimiliwazebomoxa.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/powavafowarifa.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/23100949678.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/22172970622.pdfIn PDF document text
    • https://paperland.bg/uploads/file/43893369290.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f54838c59---90953727564.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/45758613006.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607097b98d60b---panipinijel.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/96636425872.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792a1d8885d---87673957439.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/46252449080.pdfIn PDF document text
    • https://yuss.it/file/58453248797.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0f9e3aea---99187092349.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021625550484959.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160710108a0a49---45815055108.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///88800889936.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/tefaponerevemuvogorupuz.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/181399948.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1a9e98f3542202cc9cc581bd3f5fe13a/55877216106.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/joravopevubofuki.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/retejumimokewinikeveke.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1b48b87145d0700b5a2418435fdf659e/70962343358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=octane+elliptical+q35+manualPDF 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_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 17812 bytes
SHA-256: 17d831f091dbdf48c6e10e99c768edf2742495cb6600e2229ab78b7e60cf5725
font_01_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 10724 bytes
SHA-256: 83af6f3de2de1765b42875a28cd602378e0efcb1e5706aa6cc740c2440ebe659
font_02_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1