Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a20f6e6d0405cb…

MALICIOUS

PDF

98.2 KB Created: 2021-08-08 17:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4c4533f276caaee2d841779bfb1610e SHA-1: 937bed3c7ea87cdfbd00200a7ff493cfe11dbd7d SHA-256: f3a20f6e6d0405cb50ba29729c554553ba74373cccd49e09f01f0e54af364bb9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution are characteristic of a malicious link aggregation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://hyundaihungthinh.com/uploads/images/files/88127999171.pdf
    • http://terrietanaka.com/library/files/nebotavuvuli.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bcf5374c8---kofagividizexabupojetasa.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bb748d3dbb6---puvubaxigugezu.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/i1c5tk627bjmun2aecjjtntj32pj5tla/57310814228.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c47aef71---lijabutanizimijo.pdf
    • http://allprintusa.com/admin/images/file/vajedabimigazuzanutege.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6e8f0d433b61102860ab2a077721b365/wudonefizapizikubuv.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b1bd03c9c---nulubusujowuk.pdf
    • https://transmar.biz/ckfinder/userfiles/files/rakoxudesaxomalilufe.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4320c7976---95720853245.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a254d23440c17ddf2e52ee72e0d2a496/vuzuwuwatofowigeku.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b64ca496e2---63838763598.pdf
    • https://sanidom.pl/img/file/nevasofuvu.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a9b9b84f---zukokosudizidonivo.pdf
    • https://dodomacnosti.net/data/file/59445836024.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbe693eb8---jafataluta.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/kaluzitusixog.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/59b76e7600d9536686e765ccad425a80/57146442786.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/72749800267.pdf
    • https://mysmartedu.com/uploadimages/files/43598151927.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0sjfej2rpd657abkagq047bhp7/nesetonunozepumifedesida.pdf
    • https://luyenthitoeic.info/userfiles/file/58957802405.pdf
    • http://sakem.org/userfiles/files/94894414247.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=compl%C3%A9ment+du+nom+ce2+lutin+bazar
    • 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_off0001155b.bin
3aa5190a780d99b835447684ef1f07436b488bcfd6b61be0035e6aa545631933
pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 11112 bytes
font_01_sfnt_off00012ec7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC7 16792 bytes
font_02_sfnt_off000146d9.bin
427eb53120e5ed42efda8e6f8479592026a1474757681ad3fcb6b081842a92df
pdf-font-stream PDF embedded font (sfnt) at offset 0x146D9 20048 bytes