Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c9482a11d2919b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 19:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aabd54d142c5d9d57a68fc21486dc712 SHA-1: a4f6216b49714a94c173deb63e571879d9044b16 SHA-256: 64c9482a11d2919b1ed8784dd877399676925947eb563a3ca397ef48238cd74e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs hosted on disposable domains, a common tactic to obscure malicious destinations. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to evade static analysis. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=unpack+zip+android PDF link annotation
    • http://kgmda.com/upload/files/wukekonafixoja.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lg5k022490j9q7u5i2pcvfir11/godeferimusefojijusuf.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/97616951548.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/23778623869.pdfIn PDF document text
    • http://mamitobe.ru/files/file/jatowerusela.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/notule.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630624010.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/1673037887.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/72650594415.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/tubogawazazow.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109190356144262.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/debela.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/51386971856.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/74645222264.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210904000259_685367264.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/vimabozatofi.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/sorajat.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/43824515198.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/wotajuz.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea14c71fce---4163123730.pdfIn PDF document text
    • http://heizler.hu/files/file/majofunevetafafupakasug.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4bf30b727848bbcf33a78996d8db3169/36393185756.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/12785983990.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/51080689734.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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 10220 bytes
SHA-256: 9ba5ecca33ecb3830a4baa3cb466d1bbd022446c61fecb26c5e7f7c295e118c6
font_02_sfnt_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 18528 bytes
SHA-256: fec944dfa5324bdf91ee9ef4df31902191e1a71f263a5dce019889fd8890dd9e