Malicious PDF — malware analysis report

Static analysis result for SHA-256 05faf734c1e022b7…

MALICIOUS

PDF

85.9 KB Created: 2021-07-22 11:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 336c69ababc7c29e5c43692f63857c89 SHA-1: 16560726b7c51168c634cdff54902e30eb238314 SHA-256: 05faf734c1e022b79cded6b30b0c773204c67827ac714f803694cf67ec4a82ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://classicalgardenornaments.com/uplds/file/votefeger.pdf In PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/5f8a50c78492804da0a1c40c983df10a/81513349896.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086414e3908b---vebakip.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea5d1965b2---borex.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/8093660453.pdfIn PDF document text
    • https://x-software.cz/data/file/dokanapen.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/80749646198.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/60290805153.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e9d8ad143---fulazumexapagivusilasuwiw.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/zizigigikonazikil.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/11412266260.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/15865513518.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608860d3f1233---tovomodarigawelep.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cg93lkpqogsqm857g59gtoerbv/dajoso.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/86114845194.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/28222224530.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087268424203---70339696437.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/fobufuv.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14be6218d5---8989264821.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/30326321940.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8ae4bded780c8ae7d60add2af03abc52/tapesoguxurixabizepu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/7jik5b8v2ca10895ltpsscdau0/fubejewimi.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505072044999596.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/75093535766.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/29233100091.pdfIn PDF document text
    • https://peterdegendt.be/file/gerenikebunivuzotetemezuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=toefl+speaking+practice+test+with+answersPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 16752 bytes
SHA-256: f00b4b04883acf0774f078230abc3ca82070e6de67117b608e1d34981e9092e3
font_01_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 10900 bytes
SHA-256: 68dc134a56f69ae21a05e35a9f46519a332bf6c85ba7a1b0de00d04f8428f1ea
font_02_sfnt_off0001360f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1