Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c953ce5b0386a0…

MALICIOUS

PDF

82.4 KB Created: 2021-08-29 04:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 800ecc833d892f7299054cb031f5c871 SHA-1: 1d2ceb57af8370a57a856b76c4e6445296148d14 SHA-256: 76c953ce5b0386a0f0e00688fb0224a6df4a97376ee631d38d82e9fbef2d55e6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://yer-krasnodar.ru/ckfinder/userfiles/files/12197852881.pdf In PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/fovefud.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8fb94611---78125916911.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/61337732856.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/6gcem9f7fe8938k2taibjh8htk/22592080188.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d16fef314181d1e676bec82ad36a1333/93306175976.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/dexipuzizezir.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e21a3628b1986ebd31a40ae021ee5d48/80156904761.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/wemas.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/da7451775ec5ef259f717d2c4eac510a/3372756090.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/41873037777.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/kobokabimugoxopuvegojin.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a3f320233---54448456051.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/24354062007.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/8732001583.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/94904100350.pdfIn PDF document text
    • https://auto826.com/uploads/files/mepebemopuwumawev.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/gajexu.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/69730196887.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/78417983044.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/waviz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08c861ef9a---44576150329.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160dffcd5cf627---tijodunigepagarafir.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5bd9e1b0e---72647263560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=selena+gomez+best+outfitsPDF 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_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 10832 bytes
SHA-256: 7ab28c55519e9a1d9a774b01168fb8be88b447e8590a5d89999d0e4112f86f1b
font_02_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 18000 bytes
SHA-256: 0eb48ff12febccddfc7217e647dea82a4367952306e79e923534593f1fbd782a