Malicious PDF — malware analysis report

Static analysis result for SHA-256 115c081de4959bb8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 04:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9f0e5e829bfa8677cfbbab244387544 SHA-1: 085716446805ef311c05efa95df0f006b530fb9f SHA-256: 115c081de4959bb8d8ee5749d15feb3e0e8f9914f060068992e96a6c8fa8fef8
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drukarnia-warszawa.pl/pliki/file/98973314842.pdf In PDF document text
    • https://airshow-bg.com/file/16160093701.pdfIn PDF document text
    • http://chikatere.com/Upload/files/vifutiwiru.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c242556b89---kifaleruw.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/13913533753.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9b6edda8---51079153170.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3803b8ca---rubajatimebo.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/nipuj.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/7161673453.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/665a77dd46397215dd497263c9feb845/63140920973.pdfIn PDF document text
    • http://giga.sk/storage/file/57852168725.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/41139962184.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074a735cd9e8---42562450054.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161009d142c7e2---gopogizukuzafefiwefa.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1023850b5---63227027323.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/nejoperadagut.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210710111718111.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/5975603997.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/zegujemoxabuxe.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ab8cdc7a---83096462613.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/38066459051.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/83128017709.pdfIn PDF document text
    • http://trevorhannant.com/zolabafaguv.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a315d03be98---85598720348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=logic+2010+derivation+solutionsPDF 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_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 10964 bytes
SHA-256: 46bb00edcc1851d0fb581741344cbf827f10941d5a4de480fd6e5732c9b4b7ce
font_01_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 18180 bytes
SHA-256: 1e1eaf7b28e922c62ba3491cf13a50ee7c9afaaa616b1bc1e373039ef91814f7
font_02_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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