Malicious PDF — malware analysis report

Static analysis result for SHA-256 068d26c1a9dd531b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 06:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 90cca5612d6e24d4f461c37b1ac72950 SHA-1: 16937832be2162c2cb76993f2f2d1866968bd859 SHA-256: 068d26c1a9dd531b18407f1735406aa06005fb1f1dd29c44d7176e0aeb3877d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://costabravas.com/uploads/localidades/files/doxevusakepinu.pdf In PDF document text
    • http://lab4050.com/upload/editor/file/96486023458.pdfIn PDF document text
    • http://clickvay.com/upload/files/nolimidegumok.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/84945949685.pdfIn PDF document text
    • http://clanlogging.com/userfiles/file/tudubipobebonebarowabazi.pdfIn PDF document text
    • https://soechi.net/userfiles/file/39671680461.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/60841994314.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/5531666376.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130d003719c8---38121349810.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/vajubazosufefesole.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/livoxo.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/banasebisorufow.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/58ba71d2f928741d08fc7f648ae29315/43396602663.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133621c4d84d---fabatizixa.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/kavifovuvuwemivaju.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/81010239700.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/10618436090.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/44722673212.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141e14ba06f3---75811457183.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/vupobizozokeb.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/bipelamuvalewowijunozej.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/sewinumarelazoragaberigof.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1f0e6e6b---36912637232.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/80698822640.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/segoxilubolidi.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/82851716607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+android+equivalent+of+itunesPDF link annotation
    • 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_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 17168 bytes
SHA-256: ce325b65b78a4b9fd4d7c9b057c9e2dd093c4ae685c185e3f816b0a705aa3b64
font_01_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 10756 bytes
SHA-256: bf10cc83e067825b31c45ee9af7114a7d18355f4c247f4db5775d0f63af53e18
font_02_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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