Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe22a3b37cca3e25…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 15:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3661043742a731c3cb74f2918ba54ae8 SHA-1: 9919c918a4a6003cc5d29629670dbb93c12fb091 SHA-256: fe22a3b37cca3e2585df5f9c2fed5ee4d86e2d84bd7eafe28c261297e2dfcfc1
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. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a tactic to distribute malicious files disguised as legitimate software downloads. The presence of a 'utm_term=download autocad 2017 crack' in one URL strongly indicates a lure for cracked software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://idroilektriki.gr/files/file/71084682886.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/p82jnnlcif1q4bbudbrph2ki3i/gobelonugod.pdfIn PDF document text
    • https://seerupit.dk/assens/file/xotomalivunodaxitara.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/27969528811.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/sotefilazip.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/vipodumivakemef.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/52468815656.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/vomexawekegutamafujodavag.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9e4b5731---dofizezitujedaporux.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/kefosudisag.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/tonutewu.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/ratobopovuxa.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/kamuzemagiwefet.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/jijariponu.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/62790843257.pdfIn PDF document text
    • https://trieurodata.ro/images/file/senijedoninox.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161396aa75d03d---85286618582.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-3/20210903050108797464.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/1737847072.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/470084041.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/rurutifomol.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613da778d996f---tudet.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109121104425443.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/15322788355.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/86865261690.pdfIn PDF document text
    • http://budropol.de/Upload/file/11698923720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+autocad+2017+crackPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 20540 bytes
SHA-256: 0baab0922e685760cef1e9836f18507921d428963e10898444b4fad612a2b017
font_01_sfnt_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 10596 bytes
SHA-256: ede4ff27c207a17a198ef26b09d3069d6aa6acba660233da7b67e21478de0f70
font_03_sfnt_off00011d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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