Malicious PDF — malware analysis report

Static analysis result for SHA-256 730f3bcf56d0cd87…

MALICIOUS

PDF

94.6 KB Created: 2021-07-16 20:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cd5da3bd7353fd957fabfd13814754c SHA-1: 20ced81f85306f040ee15e236f14f6611de2abce SHA-256: 730f3bcf56d0cd876b1af0af9ff8ba339d4981ac7b6da8092668bdef21bacc23
156 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. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/89d806b9b3bfa086a2289e11190a983d/timeloduguta.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f93e74a2957200ca0596e9cd3b7f30e7/62560273981.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/52897801080.pdf
    • https://farmacieitaliane.com/documenti/file/3237518067.pdf
    • http://sibaco.ru/ckfinder/userfiles/files/buxosufusij.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608572df51ba6---nopopevunexetepowapotumem.pdf
    • http://profil-metall.de/content/uploads/file/87844050067.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/53484668291.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m28e1ic6jf9pfb6brv7ndsht8p/tobomolubezezagevitepik.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/84dkgeethd7doeog73378s2r67/89468481048.pdf
    • http://nhatminhtrading.vn/app/webroot/uploads/files/89620091700.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nnafa1j1eplof5j0ktm637v1r6/90740462289.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07f8684ec---45168266421.pdf
    • http://eastcoastbiker.de/sites/default/files/file/senufobazegutiwunuregize.pdf
    • https://personnelcle.com/userfiles/file/nadazibuk.pdf
    • https://xigmatek.com/upload/files/mumalurugupamunuki.pdf
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/22911019931.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/054aa33d821a890bdae942a0e4478432/lupisifo.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717574a1f1a---dopej.pdf
    • http://fandimnarodaku.cz/upload/file/sajusanopijij.pdf
    • http://arohitourandtravels.com/userfiles/file/balewapotutekuxavufipur.pdf
    • https://drnanemilk.com/tctt/sites/aaa/file/96283765477.pdf
    • http://ecilingirler.com/resimler/files/ruvomitugekonabagi.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a985b4c9684---dedebifedojibukafime.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=they+were+liars
    • 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_off000110d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 16792 bytes
font_01_sfnt_off000128e8.bin
82f448cc8da9c037963be04cfc6203c5a45d80a172875b58d632aa4183062331
pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 10048 bytes
font_02_sfnt_off00013f66.bin
e35753ea2a7d96ab237955c0c8cc52c4918e6c926fd8ff1d29037bd44cd9521a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F66 17144 bytes