Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48ffa17386c4d58…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 06:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebec2136f4f24d0ebf84f8cdfad5d74f SHA-1: 4fe6a2f7a259a8b39ab48bdbca7951ee918516e5 SHA-256: a48ffa17386c4d58d83e9b9464d504e07ad5db90f8e997be60da0ab92f4681bb
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 CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ada0c4a66aa7cfc3315562220c3b4ddf/nugokamizatorujopa.pdf
    • http://haustechnik-hagenauer.at/73182852058.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/87f23d0f15405b6b37d8cd5732905158/movutibosib.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/0fb07eea5f5099d58afcc527a62fd189/gupipigu.pdf
    • https://chiuman-hk.com/images/file/romelerinozozixumaja.pdf
    • http://kowel.com/ckfinder/userfiles/files/1630727684.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/68832896198.pdf
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/nizokafil.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/gulugosamirimokomur.pdf
    • http://xinge168.com/uploads/files/20210809120842_253808.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098160b45a6e---zasolajanopolado.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d197c445f5a4368551eb7957a7c9adeb/82710851642.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/lshaeuc98n1u20068m5ee06p97/kejogumukexamikafobug.pdf
    • http://kientrucphatloc.com/upload/files/41064902903.pdf
    • https://t2sc.me/userfiles/30106815066.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161027bd5b1ee3---tutusivutilikanawowufaxa.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e0f15546fd21ae65250e125a081044d9/5414441772.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/fdd839f67d040fe230cde473a7f8d4fd/fikazolexaperiwil.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/15856074019.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8a544e3902a112c7d0e05b9ae24efa43/72684473394.pdf
    • https://kildevangen.dk/files/30491645455.pdf
    • https://airshow-bg.com/file/53616385188.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=walther+cp99+compact+manual
    • 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_off0000dc83.bin
94c0cef10bac95c0cf0e4d9a2560b882f319612f99ec93e3a8a4f4c792f5a148
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 17892 bytes
font_01_sfnt_off00010a05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 16792 bytes
font_02_sfnt_off0001221c.bin
e06340f82af4d1c2660536140e18219a544acfeecf9e6e45043c932dd73c60a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1221C 10640 bytes