Malicious PDF — malware analysis report

Static analysis result for SHA-256 097f3ad9a3dd5827…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 16:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0183ef70bdde5e09f1d8dd3c93bd7492 SHA-1: 05a7be67e21d9d805ffd47f4c438fe6e864abf46 SHA-256: 097f3ad9a3dd58270f9d505e51e6c1c84df7dfd052d4fc1df67581387984ecc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=zombie+catchers+mod+apk+for+ios
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/momowagisozepawunegemet.pdf
    • http://przedszkolenisko.pl/userfiles/file/tomojiwutidepadafanina.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/17d1eb04e2d6a75ab1cc4d91b1bf296d/46063731543.pdf
    • https://mahae.hu/files/files/6149846783.pdf
    • https://sim2007.com/files/7831353975.pdf
    • http://canyonmeadows.org/userimages/rowilej.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9d6588f0115abe1b28a49ef087b4a5f6/7167239456.pdf
    • http://fabriziocar.it/userfiles/files/xijepiw.pdf
    • http://stauarchitetti.eu/userfiles/files/44599426818.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/11277ffc11dc3bd5087b7cdb90431f46/fuxodutinifugeliki.pdf
    • http://briztravel.com/upload/files/kegaf.pdf
    • http://ambulatorioveterinariocamali.com/userfiles/files/12412214491.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4db37c4a7b6183d2bd8c068865816cf9/tuvezediza.pdf
    • http://shiny-baby.com/fileimage/file/44180627163.pdf
    • http://seritour.com/rsm/files/24938814385.pdf
    • http://boekenwinkelindex.nl/images/uploads/30970269480.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e4d345927ccbef761fb294117b8a231a/wuropifufewagumoxowop.pdf
    • http://studiospazioambiente.it/userfiles/files/36044854677.pdf
    • http://machinegroup.ru/img/outer/files/pomosege.pdf
    • http://styrexon.cz/userfiles/file/deduwufema.pdf
    • http://hotechike.com/files/files/jewanoteremifejuz.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_off0000d2dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 16792 bytes
font_01_sfnt_off0000eaf3.bin
caf1dbcf7487e6264cb400d62a885a8bbac61c495f8d4042f1caa6b70f8611f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 10932 bytes
font_02_sfnt_off0001041d.bin
e1f912cbb5a7cb53735451160ee3573e44bdf07218d0e401c2085f43ba43b068
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 18368 bytes