Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd9bbd4fda8930c…

MALICIOUS

PDF

91.2 KB Created: 2021-06-26 15:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45c4b7e74cb3ef7a609f9b95ed6110cc SHA-1: ea09976c0a6ac6c7575c7b2c1c80b825fca836c4 SHA-256: 0fd9bbd4fda8930c477d79f9744307b131680318cd55f68527429d8137f891d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The PDF also contains a large number of links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=harrisburg+parks+and+recreation
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0836810b---97329834753.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/de5d314351e8d3443c04a8432a0437ca/lowisoleponi.pdf
    • https://parkettworld.com/upload/files/34633749124.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070da33c0242---23577401391.pdf
    • http://hakkabrothers.com/userfiles/file///69327377133.pdf
    • https://agatanorek.com/files/file/kegilemuzuwejegabanejuw.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adae330c57d---81921935121.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f745e4e05---kenebiwilaguraduzovuza.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/96c021786541ad274cff4fabafcdf78b/tesatusigopiv.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/02f7d44e1331f29bda24f0a673cd9c23/95690587242.pdf
    • http://4998horo.gmmwireless.com/contents/files/10224458221.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607b847003fc1---89601764484.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16084ac030682f---62370821309.pdf
    • http://jjmcp.jp/userfiles/Image/file/zonotuxeweju.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b083c5eca56---33381541075.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a72023519---52558614333.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/miwenatotuwapevivimerilu.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/p1fhdba6g74fib24fel8fg05ua/24142040351.pdf
    • http://scoutpate.com/userfiles/file/nawusefaposumamafarowal.pdf
    • http://brukbet.com/user_images/file/71702671397.pdf
    • https://contactfm.be/userfiles/files/73423757267.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f72f88986---nofonanukexivepenor.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_off00010034.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 16792 bytes
font_01_sfnt_off0001184b.bin
c8079fc1bd23bcb052ddfd5473593f5be760fb0b0d176c38a80e00c86293ae73
pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 10968 bytes
font_02_sfnt_off00013169.bin
137a4e1a53c843c19cb7ca06af93824d1104658c85812c53149b1a4110088a81
pdf-font-stream PDF embedded font (sfnt) at offset 0x13169 17628 bytes