Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f9050cff7376a1…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 18:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 675c8e54cbc6a332fdb5541d9ad05550 SHA-1: a7beec3ec9d43c0c2d11644248023b2bcb5db2c1 SHA-256: f4f9050cff7376a1f36d00f915763e492f482fbab33bb33d98d0faa63c9a1df9
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://abbeloosschinkels.be/userfiles/file/22497938412.pdf In PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/peluvufuxuved.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/15846960027.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/bevedenagebaj.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/5229371635.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/jedulevekoxikepuxof.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/33879403969.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/litixaw.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/50820137744.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/65886791713.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/84365381789.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161347e38e8f6b---86983361472.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/rusifeselaxifa.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/8653860897.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136922248042---tavazidanos.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d5c8b876459233daeed5035eb68dfc66/gesodibuvoretujitonorad.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kunaliwafe.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210908_205909.pdfPDF link annotation
    • https://magerp.org/upload/files/tatiribixiwipalorul.pdfIn PDF document text
    • http://agilesolutions.in/uploads/92381530697.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/zewunin.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/govegazosidovodajirug.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/34061028310.pdfIn PDF document text
    • http://midel.me/userfiles/file/44786678630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+app+killerPDF 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_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 17216 bytes
SHA-256: be506dc6c9b20f4f165328a3b6bfadfba8ab02b57e008c890187d6d53c4748e5
font_01_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 10192 bytes
SHA-256: 78418c6f9ffa185bafea48b3e01be63027ad3a19a74feae10640d966901daa8a