Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61861de039dfae5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 21:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c11dcf7af252057f51d53ca8081b4e5 SHA-1: 285bbeb2999a18c15906193fd926360771e4cbc5 SHA-256: c61861de039dfae520559f085ed479f87a5bc81f7fe02491af7e172efee99de0
196 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://www.jindatunnel.com/up_files/file/tabokuto.pdf
    • https://tort-art.ru/userfiles/file/67239811323.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133590a42ded---75934280287.pdf
    • https://paeonia.ch/userfiles/files/bibowovimodotemitoxij.pdf
    • http://kubablimel.pl/Image/files/6327230775.pdf
    • http://trust-law-firm.com/userfiles/file/20210911133141_1505569968.pdf
    • http://tylincms.com/userfiles/files/82799455770.pdf
    • http://charmingcurls.se/upload/file/mezigi.pdf
    • http://moonlightmontessori.com/upload/files/navazafukurajo.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/4156243098.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613175b2de9e6---79914543171.pdf
    • http://graczeonline.pl/userfiles/file/86103316191.pdf
    • http://ibshop.gr/uploads/_uploads/files/43100979592.pdf
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77516462745.pdf
    • http://jarosi.hu/files/file/jufetazibininasut.pdf
    • http://1-sanya.com/blog_images/blog_/file/17301636173.pdf
    • https://alamansyria.com/userfiles/file/93200083582.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/23e27f18d85092b257beb7207b3148fe/92369936868.pdf
    • https://greenboo.vn/uploads/files/52755171506.pdf
    • http://hanlacsclub.com/ckupload/files/lokiga.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/19699092708.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/82750202986.pdf
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/semil.pdf
    • http://moonlightmontessori.c
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+transfer+files+from+laptop+to+phone+using+wifi
    • 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_off0000d25a.bin
505c64e480792ac96fefed7022e3431abc7426f0d2a54e4a305fd9e6a35e5b83
pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 10980 bytes
font_01_sfnt_off0000ebab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 16792 bytes
font_02_sfnt_off000103bd.bin
33dfa792eb2771c87eeb03496840dc7e4e536b96486abf69bd5579689d32d7c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 16148 bytes