Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce442e28f23cfc3…

MALICIOUS

PDF

82.9 KB Created: 2021-07-06 14:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c826845d527fe84718ab7756ec1680ce SHA-1: a46be6b1a484ef5f2c879e518561d5077ab477d1 SHA-256: cce442e28f23cfc380c115b632dd474e49bb8379caab94d2f74e807d0ba377fd
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 or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=carrom+king+hack+version
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c2a5b9039550203c166fe4504e06a178/vifojidifavuperez.pdf
    • http://skiflogistics.ru/userfiles/file/25753023412.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/wupexawemutuwosunoputaben.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d34630c7---42062445109.pdf
    • http://re-view.online/fckFiles/file/48853225640.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f27d2df0---razugut.pdf
    • http://4bx.pl/public/file/14550864645.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/82528302790.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/92075872288.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077faa561aad---81156445207.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdb8e9701b---22556153666.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/li7ithjt740t8a00hjghm3dap2/50276622362.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/07rm60gma7fr341ahqi7d0rdik/xanape.pdf
    • http://hopkinshigh1961.com/clients/878968/File/kojanegejemela.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/83361290408.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8940ec0f---fuliwaxesuluvidojawuveja.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/9d37e92a26bf004ff355f3407128de77/49599477441.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cfc49801c---41791832294.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d21f331d7d2c4f193c77a1fe18bf70de/buzelotova.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/cf560f1d5538bd6d9ad6eadc6ae047d3/20938086843.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba94eb26132---benarugepi.pdf
    • http://geoass.eu/userfiles/files/51694370048.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090885475c63---33797209168.pdf
    • 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_off0000de43.bin
c0a208413aaa0909cbf7dfb403069810e17a4d52191607b4ee194f4b15a2f1aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 18268 bytes
font_01_sfnt_off00010e11.bin
5769101367f9738b757c73f66ed7d90623ab64659a4d9ff56c370d2815bc3252
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 10724 bytes
font_02_sfnt_off0001268e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 16792 bytes