Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55c89c3f483aa98…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 10:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcdca800aff228e16f54cfcf46a2b617 SHA-1: 353b0fc54703406786f75c9fa216882dfb65e761 SHA-256: b55c89c3f483aa98aeb511bb79ea360a604f6c5bde339e7693ef5332828eedc3
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 potentially compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple external links and the nature of the hosting domains support the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://selidbe-beograd.info/files/wojoxev.pdf
    • http://dragoniresorts.com/userfiles/jerafofonelon.pdf
    • http://metabolit-plus.ru/files/file/65498934710.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/pemakamu.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/roxetuwezumonixitoji.pdf
    • http://hiredriver.com/uploads/assets/files/vodisom.pdf
    • http://mwcapital.net/ckfinder/userfiles/files/taxeb.pdf
    • https://073741256.com/uploads/files/202109091007462505.pdf
    • http://888chji.com/userfiles/files/95045750542.pdf
    • http://gonganmi.com/userfiles/file/zorolamitekigatidofimubag.pdf
    • http://iberryhomemade.com/userfiles/files/57019803700.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/dutotigusikuvu.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/df5bea5b81704f212d1d58f28f26e1bb/12988818753.pdf
    • http://tiszaikaland.hu/upload/file/68195874883.pdf
    • http://dioblina.eu/userfiles/file/20876400098.pdf
    • http://gelikonline.ru/content/Files/zoxefe.pdf
    • http://tutek.eu/userfiles/file/zumuvid.pdf
    • http://www.cemeba.com/uploads/ckfinder/files/80333051198.pdf
    • http://duplisite.com/userfiles/file/pusetomofediludof.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/20095567434.pdf
    • https://mklaassen.nl/images/file/3045036161.pdf
    • http://avtokapriz42.ru/userfiles/file/javinetazexibusosofi.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jhf3lni8p11apoommu85pto677/16444651409.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/bb23ef61a78ad4a53073bb9aa1a13e6c/wuzelederamuwazava.pdf
    • https://proia.bg/userfiles/file/nigig.pdf
    • http://www.firengo.com/userfiles/files/lakaxuramigiribe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=secret+codes+in+the+bible+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_off0000d68b.bin
4a3038e9e7a644849dd8a9c42f2a8150084c3373ed48131ffda4e41e6aa9fa8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 17472 bytes
font_01_sfnt_off00010368.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 16792 bytes
font_02_sfnt_off00011b7f.bin
6d4de996f49f74391cce1f745671f84a2bec1e31d34e8bbbac5bdf4ec31ed252
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 10768 bytes