Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2096aafb50d6dcb…

MALICIOUS

PDF

90.3 KB Created: 2021-07-31 14:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59dc6696a1c0bbc3a45828f02dc3b97b SHA-1: c60e74a906d968bb2ba0c5e159da0cabc9f0bd8a SHA-256: c2096aafb50d6dcb3ec34391cee2da081235fe20d9fd698534468e7bb9a2d8c0
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/97121ee896c22be5cffb6ac71667051f/ganifapaminiru.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/bb7b269d5b20ecb94595dc6b4ff03f94/tupunafiwatexoti.pdf
    • http://longvu.vn/Images_upload/files/lisekapirijorepinox.pdf
    • http://gamax-motor.cz/data/dokumenty/melake.pdf
    • http://buergerforum-tirol.at/file/24672120706.pdf
    • http://maduraigarlandshop.com/userfiles/file/tawodugepezek.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/72a251d438c68ae9cad37e2597edce1a/wifujobokuwoxu.pdf
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca83562b25---jegafubenuxenufow.pdf
    • http://farashimirooz.com/files/45584014866.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/291661bfa55cd017598659bfdc64ff2d/87958189012.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2c8f61ff831416191d1a02d1193c51d1/7644542599.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083264edced5---kadoroxefuk.pdf
    • https://aashianarealty.com/file/wodebisopoginibalozoz.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073f8a89de26---86172405915.pdf
    • http://zge-led.com/luodan/images/userfiles/file/vimimo.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608563a16f394---zawowajopuwopinegija.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/fasudasedikeviwi.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8ba620e68323b7287a3eb66dffd9b682/tatagenojukufewaxurenejef.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b289bc8176---24251115511.pdf
    • http://englishplanet.info/ckfinder/userfiles/files/24844857564.pdf
    • https://sport-jicin.cz/dokumenty/99144984152.pdf
    • http://okmarin.ru/userfiles/file/33359763544.pdf
    • http://szintai.hu/ckfinder/userfiles/files/zidobujavi.pdf
    • https://kham.vn/userfiles/file/wifuxulesegisi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=new+super+mario+bros+free+download+for+windows+7
    • 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_off0000fc5a.bin
e9f7d2809b84b50f39490aea58ae7b93161af1d04ee6a2860c1028e4fc7c2d10
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 16636 bytes
font_01_sfnt_off00012777.bin
d5766a27cfd9551255a04abc59094ba917958cc14ee9a66ba6fa904a2c87c07d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 10912 bytes
font_02_sfnt_off00014093.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14093 16792 bytes