Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4906b3059ef161…

MALICIOUS

PDF

90.0 KB Created: 2021-07-13 18:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb739bd83c558f6dff063417072016c5 SHA-1: 9675e9d587932cae30cab2061bf31a22e0e694e3 SHA-256: 3c4906b3059ef161d4e84af92a47242d54ea999c8771289177064f8a3b77ccfa
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on disposable hosting and compromised sites reinforces the attack pattern of using a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://aravlicraft.com/cmsCart//upload/file/kigunifi.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca461a893a---gegisuwamawopiduzuwo.pdf
    • http://thoitrangvabaoho.com/Images_upload/files/nunudebejotasamigadoneno.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098925346959---51341428767.pdf
    • http://vetranhtuong.info/luutru/files/55117392863.pdf
    • http://absolutelyneon.com/userfiles/file/kugukinusododuzom.pdf
    • https://fcksa.com/ckfinder/userfiles/files/keniteridodasonakefapov.pdf
    • https://airflow-skateboards.com/upload/file/96183929745.pdf
    • http://tvkinter.com/file_media/file_image/file/gututatep.pdf
    • http://polletnv.be/uploads/files/49047645632.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/wivalujewuru.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/p8dinn9o3npj5h2gocgmm2bmul/sakotetanuvojebo.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/3q2c9oommsgbp7nchkq07eri5l/pekawozanomiruxas.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/i3u4b7ha89lddenib95fl6sppb/81307713342.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/67b833ad0d6649414a1a2c0bd71b6d46/balegutuf.pdf
    • http://mega-stainlesssteel.com/uploads/image/files/49006337805.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/difuxozowojasapos.pdf
    • http://yao-cheng.com/uploadfiles/20210630192213.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/244fe850f94ef89ebe18c135f38a9d8c/xikuloroguxijevo.pdf
    • https://tmtteks.com/files/savisipizofeto.pdf
    • http://matras-devison.com/upload/file/kukawebukos.pdf
    • https://aymsoft.us/aym_image/files/subobikofanewujegudime.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qo51887f6q7q602lq4f15mg76k/ruzol.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/99702651c763b4d16a3d0b014af2857f/xafowunapi.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jqsds0da2v2p2kcaameumpbfb2/vutame.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+art+of+saying+no+pdf+download
    • 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_off0000fc64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 16792 bytes
font_01_sfnt_off0001147b.bin
4a59c2032c4832a8e2f2525c69176052b1c8165f97e8e2560ff2343db9274226
pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 10940 bytes
font_02_sfnt_off00012dad.bin
02f9031a0293f72245bfcc32d99aa560c7f0a7ea7d833b17296c14d9e740f184
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 17632 bytes