Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72acebdf239862d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 13:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac5e93c6da24c13875974f01f430e734 SHA-1: 989dd84af5822a6a60a8a94bc32f040c017ba817 SHA-256: a72acebdf239862d45d1d13ddcb1f08df373421c334ccf7ac9be68d4dc1b5b78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which point to other PDF files hosted on potentially compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=mame4droid+139u1+roms
    • http://ranjitabiswas.com/userfiles/files/wisasakebaforilapadew.pdf
    • https://at1-turbo-j3t.com/contents/files/nenoxanul.pdf
    • https://corpusbg.com/files/fck/file/35135057353.pdf
    • https://htchninc.com/d/files/wumodakedaxiwewidot.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/jexaw.pdf
    • https://moveo-sport.pl/userfiles/file/sinewefefexojituzeluk.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/t3d4817l9g2u60tk3hvc92qcvq/zitamodoboxa.pdf
    • https://wegofa.com/userfiles/file/gukes.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144914df2775---jagemu.pdf
    • https://allegypttours.net/userfiles/files/46913582980.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210901_A0E24A4D9CB932FD.pdf
    • http://cdmatik.com/uploads/file/vafufawifuvakofami.pdf
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/87608109251.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136efefcc9f9---gemose.pdf
    • https://hargagila.com/uploads/image/files/30828029677.pdf
    • http://tuclubcr.com/campannas/file/zapadamozolawolixarurik.pdf
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/tubukajirijerigize.pdf
    • http://khmim.com/ckfinder/userfiles/files/59916290873.pdf
    • http://www.hermosabeachbungalows.com/userfiles/files/wojinivenapodug.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/soxorafesaregu.pdf
    • https://hospvetcentral.pt/site/upload/file/pominowosif.pdf
    • https://tanhoaphat.vn/userfiles/file/35842100892.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_off0000d480.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 16792 bytes
font_01_sfnt_off0000ec92.bin
c782b55f441c2a36d0eedcd9e19711ca5057b7ca24d7ae992570c8947e736c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 17824 bytes
font_02_sfnt_off00011b79.bin
d7bfe25bb88570782b8651affa06115aeaf6f9e3036019d7c5fe41e2dddddd83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B79 10724 bytes

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