Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f36f658b09ddff9…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 07:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f3aaf579476e95bfe3c739e6455b7b6 SHA-1: a680fb1b78fd8b56a833357c65c68702b87956bd SHA-256: 5f36f658b09ddff91c7745e8923cc1457be5348e5326f55a02693b24a0cbcfe4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of link farms on potentially compromised CMS uploads suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=japanese+symbols+copy+paste PDF link annotation
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebbbb63f42---vuxizuwamolabekepowu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/53779142265.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109060336418813.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/3864227707.pdfIn PDF document text
    • http://www.pvvc.cz/files/wadokurawaroguxuzuso.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/79899549978.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/vosolavajisosejax.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/wuzovovidofibozogeva.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/rezedewixupizu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613395fa2b8ca---nudomemunifuwujute.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/27253580148.pdfIn PDF document text
    • http://indemo.pl/Image/files/duzimerifepesekavemawotoz.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/84892949721.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/kereruvule.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/8iu30k1uecnf5pqae9eo7oech1/sarolidirugigasuvemude.pdfIn PDF document text
    • http://deauville.ru/files/file/vojegaguvusaru.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/ladutujejefolibebuj.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/97124507814.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/23237172419.pdfIn PDF document text
    • http://turatabor.hu/media/77106083134.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/woxivejuda.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/kaluvulolowemirawu.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/89363000642.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/2513275601.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/69462202040.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 10588 bytes
SHA-256: 294f42f7fe2f1c721734d3f81cd5f0486100e36546aaec62abbe122b97f9882e
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 22508 bytes
SHA-256: 77028d491c28ca2d9777c5ae1a3b6dec37df2d20b8a48b23eded9c35f5e6a389
font_02_sfnt_off000131da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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