Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1c9b3acf4d0b5b…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 02:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 918cc8cbfb322e11833338e7a8c6ba8d SHA-1: 57bc09a7e71bb3ab72a992c55068fd29590c7b85 SHA-256: db1c9b3acf4d0b5bd962f9e1bbd422f9d6eb2894e576c05ae1c69eb84b06f79c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links likely serve as lures for users to download further malicious content or visit phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://vimar.ua/userfiles/files/33964974721.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4035b2aba8---mazutojolibivelexiwu.pdf
    • http://www.anjhimayath.com/upload/file/14177208371.pdf
    • http://beachhigh65.com/clients/879402/File/40542533402.pdf
    • http://namngonviet.vn/user-/files/wapavotuwojowonun.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd556009096---bidit.pdf
    • https://centrumschoolka.pl/photos/file/figodutidol.pdf
    • https://steammining.com/userfiles/file/18319995573.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0ec8572880773536c49186d91d0d30f7/10835236991.pdf
    • https://rainbowfurnitures.com/files/files/befesivewovazuv.pdf
    • https://vialivonica.eu/userfiles/files/88202928479.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/55710008338.pdf
    • https://sunarchegypt.com/userfiles/file/97622939998.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/212101b914553aabd54577f56a4eda2f/28894748497.pdf
    • http://hkalc.com/userfiles/zutulawikoruputiw.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/e06c8aefab1b49c3e0658cccc3d6c156/76203602595.pdf
    • https://kuzeyilac.com/resimler/files/nojad.pdf
    • http://beerskiboot.com/img/upload/file/kaposerazuxito.pdf
    • http://swaminarayangm.org/userfiles/file/50647150488.pdf
    • http://studiobaliva.eu/userfiles/files/gegawilubosijisesuz.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/qeok0dc1ctt6f21gbmeg0eq8ts/nosematazanitita.pdf
    • http://hosungtour.net/FileData/ckfinder/files/20210704_1CCE937D3D5CF907.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609842603a260---zegiwozame.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=construction+lines+in+drawing
    • 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_off0000c465.bin
94dafa0f484568059ed22577886c1dad3bc9112aae5b967779aeef2724633d28
pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 10760 bytes
font_01_sfnt_off0000dd2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 16792 bytes
font_02_sfnt_off0000f53d.bin
d3d293f793ebd60820e9843a0bdd9df09e17744348b3a8e0eb266da278f78e3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 16188 bytes