Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e39d3a60c59994f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 03:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6b5d5c5186f4874787ca43f51b4f91e SHA-1: 2d533fc1238f5154e9ac730bdada7fccd75f0589 SHA-256: 1e39d3a60c59994fc5e83a616024d41964ad2d35e3d210c24400b814484ada14
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for social engineering attacks. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate further compromise or data theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9db302ce7---13853641126.pdf
    • https://semagro-msw.ru/pics/images/file/sofawilelikozavirujupali.pdf
    • http://izhar-energy.com/userfiles/file/84882434417.pdf
    • http://indyztyle.com/ckfinder/userfiles/files/tarosatanixubolalekotog.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1b800cb5---49548003071.pdf
    • http://gyn-ordi.at/myPix/file/wotetoxakemupotunid.pdf
    • http://orvositudasbazis.eu/images/upload/file/84916128953.pdf
    • http://kleinschadenexpert.com/userfiles/file/tutoregizilopapunevitew.pdf
    • http://dentalcenterstudio.it/userfiles/files/ganez.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6caf780eb04bb954cba2ae6b6b82c614/kejujemag.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2df257810421c578e7859107c500721f/49343310543.pdf
    • http://hotel-ambassador-nice.com/upload/files/dejaminevilanifivive.pdf
    • http://vswet.ru/f/90265792833.pdf
    • https://0286869143.com/editor_images/files/7445448129.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1bc1ddb2de4e3891dc1e0e79100de418/mejixurexokifufudemom.pdf
    • http://klaaswester.nl/img/file/kuliwakipuz.pdf
    • http://ciskmv.com/css/file/2229340322.pdf
    • http://audiohrestomatiya.ru/content/file/2966274718.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7522c154bbe820a800a491fd756ac7bc/wiruxoguvak.pdf
    • https://divinenine.net/userfiles/file/68183955493.pdf
    • https://plasy.com/uploads/file/vajolagutosokiwekovoro.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/jakumu.pdf
    • http://kietminhrivet.com/upload/files/92111592760.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=spy+software+for+mobile
    • 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_off0000e6fd.bin
67bc9d67232b1db421404d423c1d5ed3a9b3f178d3620f5c5f0c59883a94aeeb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 17484 bytes
font_01_sfnt_off00011430.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 16792 bytes
font_02_sfnt_off00012c47.bin
d0e3e3f19a7be9592ca3898097f22e85957489c580ec316a7046da2b52b3e661
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C47 10828 bytes