Malicious PDF — malware analysis report

Static analysis result for SHA-256 237dafd9eb841ec1…

MALICIOUS

PDF

78.0 KB Created: 2021-08-12 09:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e5cbb6066fd98629fdfa56c3d347b35 SHA-1: e724027320d17ea0440f128af567eb02533a3021 SHA-256: 237dafd9eb841ec1d0be57a8aafd3fcba8a94e38054658b9972677ca74874be5
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious content hosted on compromised websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pixomot.ru/uplcv?utm_term=pythagorean+theorem+worksheet+geometry PDF link annotation
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7c795b049ad0b2afeebce9bd88c793a9/41651726668.pdfIn PDF document text
    • https://purefeeling8.com/data/file/49788456174.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/de410e3752a13efa2337313d5925a25d/zobunexu.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/xenemuxowibedaku.pdfIn PDF document text
    • http://omg.su/upload/File/tozukalexalafodekix.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7598730cb0e5a00a3c5f6e2d9e517879/10998808143.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/64345591157.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/xisepoxotitovivopewibope.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/75616544273.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074181e33dc4---mizezaxavirodejabafusove.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/watiwuputiwavobida.pdfIn PDF document text
    • https://rm-parketi.si/uploads/43687060438.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca03435ad49---lidonedu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091686a1e82c---29493734471.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/36867377183.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/49223636530.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/23543861841.pdfIn PDF document text
    • http://isvpro.com/custom/files/wunosuxulurasifurabowem.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/bagogajazifikigariwo.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/36283784588.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/5737686818.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_off0000cc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC54 10712 bytes
SHA-256: c916a88ee6e03548d8298998620617d17309c27feb2c2ed75919b027536dd78e
font_01_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 17260 bytes
SHA-256: 214928199af449775191d3f93fc7c9a510e84bf6a51667e2af621c975a173d98