Malicious PDF — malware analysis report

Static analysis result for SHA-256 842cf46cf4a7f81d…

MALICIOUS

PDF

73.1 KB Created: 2021-10-01 19:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f1425c2a444b8a41820b0553ffc2cdb SHA-1: 84834a30a4037c6a0b61ab3efb0b8342e3094f84 SHA-256: 842cf46cf4a7f81d255f57aa2226339ba287d8e032dc47cd9b9b8e61e1aa3032
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites 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 through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://lblussana.it/images/file/zuzavodokinixuvitetum.pdf
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/nozinexef.pdf
    • https://vietnam-pump.com/userfiles/file/zebekagegurajolodagigitu.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16153a93ff1317---19308817515.pdf
    • http://meimagedance.tw/ufiles/files/41259446415.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/6rbtun36ve9mvmb18fdgrjrj9q/48598219324.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021092619463973499.pdf
    • http://jfhconsultancy.nl/userfiles/files/87138990136.pdf
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/28737311277.pdf
    • http://palirna-frydek.cz/uploaded/file/lames.pdf
    • https://bengalroys.com/ckfinder/userfiles/files/36460314028.pdf
    • http://topliving.sk/userfiles/file/wibudinilelutujizaxi.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0fbb1739e95a9538f2b7d34145ccc005/9185399693.pdf
    • http://nontaromclinic.com/ckfinder/userfiles/files/82763371594.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3552d36a4---67808280386.pdf
    • https://classoft.ro/userfiles/file/gogutaxogenekos.pdf
    • https://u15.ch/ckfinder/userfiles/files/guzufikagejisezojuk.pdf
    • https://ldcpc.com/ckfinder/userfiles/files/dixeridivasize.pdf
    • https://czus-lukasa.sk/userfiles/file/wiralojibetij.pdf
    • http://studioindelicato.com/userfiles/files/gefijopurodudanixo.pdf
    • https://vayamcs.com/content_files/files/34623301545.pdf
    • https://projetounificado.com/uploads/files/simijiba.pdf
    • https://soechi.net/userfiles/file/94028498425.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161488bff321fd---poredaza.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kumkum+bhagya+yesterday+episode+online
    • https://easyown.ddproperty.com/datas/files/86063087831.pdf
    • 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_off0000b3f9.bin
99af07ecb831d6178b7cd77f6c83a688d6d0b08ef19c4a540c64db64678e1cb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F9 11276 bytes
font_01_sfnt_off0000cdd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 16792 bytes
font_02_sfnt_off0000e5eb.bin
93dee4470c5cb283c174af77823d70f067bd04f12254d1087855863094876f69
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 18304 bytes