Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2837b27db48b5a…

MALICIOUS

PDF

82.1 KB Created: 2021-07-23 23:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cf0c55f84c587e32a7219487d0578ff SHA-1: 06cca660148e9715397cca54d2a60dbcf33b8e89 SHA-256: 9e2837b27db48b5a627f8003429a4d1fe709936c81ff30cf6be1169927cbd07d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32bae6ead4---18627076026.pdf
    • http://actlogistic.vn/upload/editor/files/talipurapavuripofapetebew.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080161ddab04---liluvunonito.pdf
    • https://deniz-sogutma.org/img/userfiles/file/60608477056.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/cb2b45d04ad672952bddc9dd3220ecd8/patogujobupum.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607784ebae813---gumexu.pdf
    • http://wecans.net/_UploadFile/Images/file/kasuponalupix.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160967e6452639---77056231390.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e5a49b81c14a95296ae512710e6e3ba6/43444898974.pdf
    • http://slsnn.ru/content/files/gitaninitegetamixo.pdf
    • http://a-swiss.com/upload/userfiles/file/13154021472.pdf
    • http://nagymester.com/userfiles/file/tojetibobekawa.pdf
    • http://goodtraefarm.com/ckupload/files/34752998735.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/m54vh9rv740drqmscq7dju7bm9106eef/tiguribumugenalozewoke.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed443ba22f---lukowadajerowefara.pdf
    • http://angelescare.com/userfiles/file/jatapogijulowo.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160718b31bae6f---tokarafe.pdf
    • http://hnspkjx.com/d/files/filavupuwasovudewekumok.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41d10a241---xedelakezidafudefovixasop.pdf
    • http://say-international.eu/userfiles/file/vafonilariwepakarigisek.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5ec117ad02eb0f700e8b846754776149/31469863427.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe48d0995---ratetevuxagorukidimamur.pdf
    • http://ibshop.gr/uploads/_uploads/files/43138633397.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/adcf8adb0a75c790efae2ea725c73a79/xidezetuwe.pdf
    • http://budohurtsa.pl/userfiles/file/21028975652.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/62udqmskfr4s6hvoggadcjivm0/13190182972.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=araba+oyunlar%C4%B1+indir+apk+day%C4%B1
    • 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_off0000dce0.bin
f1591a9928a43603828b0c0ab6dc33e5e0cb0f1b48c67739c17d4edb24d78517
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 17180 bytes
font_01_sfnt_off0001079f.bin
9e8466f179b3db768c362b3dbbb373fcace2182b74d8579fcc9c067723de1cfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 10460 bytes
font_02_sfnt_off00011f1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 16792 bytes