Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bace5e28e78096…

MALICIOUS

PDF

80.2 KB Created: 2021-06-27 18:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edaa414b58acd143627208920ed316a4 SHA-1: d6fbc8fd97c07f1e245886e3131a531745c5e269 SHA-256: d0bace5e28e78096c45bced5c6c8116a103e5178a6975e9f5820b9bb46faf979
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings point to a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://denizlihorozu.com/resimler/files/30786795715.pdf
    • http://fructusartis.com/i/File/73068034423.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/30074447618.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210605222655.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/76fe1499dc6fb4218e1b71e2ba30495c/97521127729.pdf
    • http://evpltravel.com/xv_image/file/wivarafadobirefuv.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/md1m7s5684qe6fk2c72ubctg62/15256571996.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/19bb0964b3efd801d7fdcc1472f455a6/losuwiburudiledut.pdf
    • http://avision-italia.com/userfiles/files/baxavifozaburujoxisel.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cbd814f6f---27053303947.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/e8a23c97be2a7e47885124e68ce5e2e8/kinapozezalozimowipobasan.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/32852fdb3d7dc78639f789c1ce9de4d5/73603034694.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609feca27abb4---pajegorolodo.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/03379f52b9ed198f3d51ea4c9a5741ae/40234400377.pdf
    • https://alihuata.com/userfiles/file/6753257345.pdf
    • https://wecareprogram.org/images/file/tiwudis.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/s1pmljjnhk5phe4hamuft5r8gh/39613612316.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/9tacnpf1rdm8n0ikpbq75mpsb4/nidegodawixi.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2611757ee5---fotikor.pdf
    • http://phuongdonggolf.vn/app/webroot/uploads/files/pixikonikozusutanujavifa.pdf
    • http://okuninka-biale.pl/userfiles/file/57017929997.pdf
    • http://cedule-plachty.cz/files/file/70608174818.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9bd410b61---zurekefolonokotijuda.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=you+were+never+duckier+1948
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf50.bin
dd7fc855de4c0778ed50545c5f68a9b8f2f1f7de5f724654d046fc4fe47dc7ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF50 17092 bytes
font_01_sfnt_off0000eb53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 16792 bytes
font_02_sfnt_off00010364.bin
a788292cca142aeed5da50f6fe930e2a2735a94866157f12b187defed158ae4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 16076 bytes
font_03_sfnt_off0001188f.bin
dfa6edc32896fcb85a056396ec5cc9d4b486fa0645bdbef84a0965aefbfa942a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 10724 bytes