Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eb6f6e0d1dc2ac…

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 11:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e6da3a00a3d4ca76cafae86f26f8bb9 SHA-1: eb196a6c86eae89bf031e91cb217a828b9ea67a2 SHA-256: f5eb6f6e0d1dc2ac401aff984518102b8ea448e75100591b3308b97399705d5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://cybernet.asia/UserFiles/File/jegikibudenememob.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b47ca713---48249483120.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083124c2549f---66839182598.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0343c536ca---zidudafelidifirajogolixa.pdf
    • http://lideparts.com/userfiles/file/1622045496.pdf
    • http://apluskleaning.com/admin/images/file/milefejatipebedoz.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dfd48396a8172c00a20b8c7b11559074/xaforod.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7796a734d---63853381243.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a8f427dd37d2a39988438d7b2585f5dc/75450080438.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9a86dcf23d9a17c6a5010013e5435574/28700844425.pdf
    • http://visit-pune.com/userfiles/file/diwosetasoseluwolexamuw.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b221c4364b9---pazoferodugomivarajos.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cedb9200c91---takazamitevelafuvi.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5c29bba6b26b1e182f711c8a96d692d1/66276911046.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a3a16d8b---94866501824.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/fcvv8r9olavobb0a6tdln6giq0/goreseluxexix.pdf
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/lokuwobu.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888ef9b638a---38252538247.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d406e3099f---89154117061.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/18de6fee35936c1af2825b8f35adeea2/27051272838.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c63752465dd---66717535853.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079d03fe2efc---87329686170.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/91848240858.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=in+a+fully+turgid+cell+water+potential+is
    • 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_off0000ea0b.bin
0908af1015146b652598120aac1ccddb1833137f1addee0ec00c52fe51094615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 16996 bytes
font_01_sfnt_off000116b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 16792 bytes
font_02_sfnt_off00012ec7.bin
eb5fcea1e1399c9a1a8e3fb5d30ec79f582d96b59521fbe28727fffe836bae09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC7 11048 bytes

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