Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd842c0dd76c292…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 11:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99ab62f1fe6ec304b1a4ec6e46ecf08a SHA-1: 7dfe9861afabcc1f0003a50061d8d44d6ca7f285 SHA-256: 8cd842c0dd76c292ff5d6595118949167c876bae502beabea0be7a7b47ccf9b1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests the document is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://roomyab.ir/basefile/roomyabir/files/54590822205.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140235dc714a---giloluvowutur.pdfIn PDF document text
    • http://hoachattn.com/image/files/35768029100.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/52573877644.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/mboafvr1ran7mlnu9fhouf2pp3/bibizuvaj.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/34561312616.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62696907328.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/89216328679.pdfIn PDF document text
    • http://boldogelet.hu/media/53385204132.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143ec3a3fc2c---mamutokim.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614456f7229a6---77004084381.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/tupuvigomajelebamasepaxar.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/39363345992.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/33256823295.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210922161339.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/77020928128.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/nafugubumafudokikajanofop.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/23656785681.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/gunopaloturija.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/fatagudilut.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/pumogalugefezurovemu.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/71124258494.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631820235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=periodic+table+mcat+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 10652 bytes
SHA-256: 639a38006a9ddf0743ba651cc7fe19a30c0658a8526fd178b545a0c7a9961125
font_02_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 18536 bytes
SHA-256: 69444fc3995b42f98d751b9bf90f8d677ad872e597b6179112f1793ea22ad301