Malicious PDF — malware analysis report

Static analysis result for SHA-256 7368850fc9f85d7f…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 10:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 908d8192756b005752529bc46ad88561 SHA-1: 846c4c1e88e952fc042267f6290eac666904e0cc SHA-256: 7368850fc9f85d7f2023ee4b403b675b9e0d2b6c60ab8a2546429e0490d36def
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to various websites, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jowon.pdf In PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/xudironerivanaw.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/1951541026.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/13892905566.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/katonixilelup.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/42498334656.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614070e18cb48---gexolivaruxame.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/60440363875.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/bafatuvuwerefezuvakeje.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210915_471A25612C7515F4.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/20428979235.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/detanepibitivupala.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/xiselo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bec06dd4c---72009130863.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/8039191034.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/98166743850.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/96923739494.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/74918438902.pdfIn PDF document text
    • http://edituj.cz/res/file/95712106592.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/mevabubotemes.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901150937715763.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/lidirobidelovefebexe.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/mapegufomumoxoro.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/d732174ae184b22e1a0d9122ab88b989/15873021773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+mega+nz+apkPDF 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_off0000cd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 10516 bytes
SHA-256: 4c712f48cf678112bee6b7f0eeb49f5d49e11e82cd5852cfbf1fa0def134c96b
font_01_sfnt_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 17032 bytes
SHA-256: d1bde7a774928f619083a9c36fc9049d3a6dde1c7010dea280feffb3c5773b07