Malicious PDF — malware analysis report

Static analysis result for SHA-256 766e0c017410fefe…

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 00:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17663667e44aa35d2cc986f36aa06b29 SHA-1: 297e6734abf85091063b4b0f97cd42a3a933484d SHA-256: 766e0c017410fefe5db6fd7a8e964db9ed5af7d5992bae5b9ae80dfd56a22f80
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to external PDFs, many hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076624a017a3---badopugetu.pdf In PDF document text
    • http://tw-jia.com/uploads/files/202108270118529397.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bqp0mi2rihkh4670s0dvrlfu4q/88586317066.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/wivuv.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/97ec55bf0a57c3a497327b0fe2245ab0/javamexalumovisewit.pdfIn PDF document text
    • http://firegallery.ru/img/upload/15458184480.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/15254389296.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zivosexiboludorasuk.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5efa490d1b---gujumerukew.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1247fdf8b3---30776057145.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b03d8cbd0e---zelulofudigemotimudam.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/dirigitomizujela.pdfIn PDF document text
    • https://fratellifurloni.it/file/tivetumodab.pdfIn PDF document text
    • http://vo23.ru/upload/file/86360339396.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd18ca6c3ff---83786299559.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58e979c2f6---9943939468.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9a72a088b54753704aa7f5f385bdf89c/fowejomejalufofugosad.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/pixutupux.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/78118530445.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/99648508995.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/12233914743.pdfPDF link annotation
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/burasusumakemov.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/zexefebitimilo.pdfIn PDF document text
    • http://charivne.info/images/file/kozowamusifepizupife.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/duviwajasobebitopipirivak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=medical+faculty+resultPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 20860 bytes
SHA-256: 4cd17d988e1e20a8ea038b3df4f3340e1f07771b3cf3a1bf8ca81964869318ed
font_01_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 10452 bytes
SHA-256: a0410c38a24edcad1a75d4d5ef3d63e93cfe485a691f0476f4916808b591db94
font_02_sfnt_off00012d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001454a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454A 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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