Malicious PDF — malware analysis report

Static analysis result for SHA-256 442406c73f16da71…

MALICIOUS

PDF

86.7 KB Created: 2021-07-13 00:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 098f52ae4316e3cc6dae7832fc860667 SHA-1: d8df6b9d2968a1bc7a9621d2c2741ac2a030f782 SHA-256: 442406c73f16da71723ef2ce3b8f376e8d1f1b4252e3372567e5e281499e6b29
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The document functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

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://africanhairbraidingsalon.com/userfiles/file/xazibujebenusezizimukajot.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b36569d6d---78892488854.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608951151c960---50608075542.pdf
    • https://alnahamgroup.com/userfiles/file/28534739000.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a95bf0d463---vubowenurena.pdf
    • http://mariopresto.pl/userfiles/file/37541491662.pdf
    • http://ndt-ultratech.com/files/46349675430.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/eab3989b016f7d62f0b96853260ee72d/vodikotefa.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/n7qs0r38u9u31e2ctje7qbjje0/55093059759.pdf
    • http://praguetransfer.com/files/file/76332294406.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a92b6e9a8a2---64890911802.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/vapukupimoxuku.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8eb10a92b602a971767370baa128bf7b/delawekakananunumaxasa.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6784d1beb3740278b773319d77c17210/nununejadexedixorelenojal.pdf
    • http://tv-sat.cz/userfiles/file/72773166976.pdf
    • http://senseoftourism.dk/userfiles/file/58354676857.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/0ec1f1c5748f31e269e306d393e91144/67920896219.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jjgdcas6pvvgvu13hgo3pb6jd7/17221526260.pdf
    • https://elitstroycraft.ru/source/file/77742354347.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093af804f5f3---50276676789.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/dd5e203e7737a942a2fa074b2fb14fba/1357143905.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b07661804c4---34585981312.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a9f3952cb33c0390688a898efc7a21ba/zanowaxopiwutar.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=verses+about+homosexuality+in+the+new+testament
    • 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_off0000f077.bin
b973f3928c3dad32a4f475454b73c6a3b0916dd0c756c5a9efe12dfac590d545
pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 10884 bytes
font_01_sfnt_off0001098e.bin
766b87928df292689b79374e5ab72157fd186fe08dd672ae09efcdd78854ac2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 16728 bytes
font_02_sfnt_off00013506.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13506 16792 bytes