Malicious PDF — malware analysis report

Static analysis result for SHA-256 b779b82c7152f019…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 21:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc9116d7c65418b73bbf8da0d16df6ec SHA-1: d129a6c2b1f0e9bd3410c7b0dfd675bb8ab64c72 SHA-256: b779b82c7152f019b71dcf53d490d08b131aa5edc6e03fc66a3b23677d7792b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which are hosted on disposable domains or point to compromised WordPress upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/6585743737.pdf
    • http://duplisite.com/userfiles/file/witibodopupufewuwiba.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/wetexixokubosulu.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613a153573168---xumewejawijozoliwegozus.pdf
    • http://phunggia.biz/userfiles/file/12570408353.pdf
    • http://yh-nutri.com/filespath/files/20210918110949.pdf
    • http://cnwt.mgo.cool/upfile/files/2021/09/05/xagunesilunasekobatu.pdf
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/libudokefobuxamatawot.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82bbcc4a7---ledogagejizonutogup.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142c108d02f8---tejigejurosojowi.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5aee2786---tuvupatokad.pdf
    • https://towa-aaa.jp/userfiles/file/bobibogukulimiwozugasu.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f374a0f5a1---fazopez.pdf
    • https://thietbivesinhanhhuy.com/asset/files/gozinoxojilezodelinemiz.pdf
    • http://eternaseguros.net/files/files/sepuketatuweve.pdf
    • http://bdnchem.com/upload/files/75160902930.pdf
    • http://angel-conference.org/upload_fck/file/2021-9-12/20210912220729615242.pdf
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/66578810253.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/megepefew.pdf
    • http://medicom.pl/userfiles/file/6217604919.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161355a8d29a80---81550054919.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=spider+man+1+full+movie+putlocker
    • 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_off0000b68f.bin
137414417123f86ff839cff218006de93733b9abd4c690ccb273f0e90ceb81b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 17548 bytes
font_01_sfnt_off0000e38b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 16792 bytes
font_02_sfnt_off0000fba2.bin
fb5a06fd4579ff57605d2146d875a7940c5609733a85355d72c7483525cbf3d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 11000 bytes