Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e56b401bf7fe49…

MALICIOUS

PDF

86.7 KB Created: 2021-07-26 21:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b9d0ebdef227fa1dea20361d1506981 SHA-1: f983bcc5fa67b03907ea704ef70f17063b541679 SHA-256: 35e56b401bf7fe49055407ab4499fffe07798aaf0e9400e820d759d901c8a413
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URIs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mmprogetti.it/userfiles/files/vutumabugaxubivi.pdf
    • https://oliogalanis.com/file/1342532560.pdf
    • http://www.pranabkumar.com/fckimages/file/17233116461.pdf
    • http://peneleos.pl/userfiles/file/lalegekenitide.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/85804112800.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kumarem.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7cf7e394ee98af41b2a495544cfe7c8b/18542404633.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/becjq7355pi5ho5hactd014l41/7806415987.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2li0ikg9250krrhffid28nilf/fuzitorusugigeva.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/96602570905.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/42db5ea2fb93837a2b5585a4a82b6567/fuzilelarowozat.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93b800ed75---35224629722.pdf
    • http://somsit.com/ckfinder/userfiles/files/70745920084.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/u1fbj1h82pc1ta84nuvumsbuue/denugovasafi.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/62330763242.pdf
    • http://drivingschool-brno.eu/files/gupadomepoguruxitera.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad89e1637e---dejot.pdf
    • http://woorymart.com/userData/board/file/78300778880.pdf
    • http://zhuoer.ltd/userfiles/file/zifet.pdf
    • https://mehreganimaging.ir/images/upload/files/50378206413.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607596640a9d0---mexuvinidesosutus.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/0097048c4e113031f556ca8977205e31/19525205586.pdf
    • https://micsys.in/userfiles/file/vitezuseloxowogaferapa.pdf
    • http://yuanyoujie.vip/userfiles/file/wigamopejejuzafejom.pdf
    • https://alleducationresult.com
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hsc+english+2nd+paper+board+question
    • 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_off0000ee74.bin
10ebfbd953eda8bdb1f78149019709aa4bbdc6b43b12e5f98b86a67f6909697f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 17064 bytes
font_01_sfnt_off00011b34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 16792 bytes
font_02_sfnt_off0001334b.bin
0c5ffd656d86d080258f96738673ebfc657e30909e677fd204b6a0e02c12914d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 11288 bytes