Malicious PDF — malware analysis report

Static analysis result for SHA-256 3126857be2c4a002…

MALICIOUS

PDF

75.4 KB Created: 2021-09-12 10:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4220bd75259fe26a809531cd99e2b6f4 SHA-1: 5cc968059ed50a39e0a5536cd87e8e6f1ae76853 SHA-256: 3126857be2c4a0028f184b7758bb642e7d1d6a9437bd0d7a828d9f85b33b415d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://maremania.net/img_pagine/file/sogaxavase.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309fad03a4d---domutev.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/35023731612.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/xezexolapu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1422740d453bff5c7cf127691542b0c7/38587634362.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/tedumun.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/0iciq9u9sk9ankonh2n1ipgok5/92532693270.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/15581926577.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/powopel.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210907_124843.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/wamovuxukorubawujodu.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210908051202.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/51a1d9dd3c7a48e6a688c84b73870b74/zuvimugidotadaxenawiremiv.pdfIn PDF document text
    • http://cy2hand.com/userfiles/26144966958.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/tawomavuguwelorumitiwab.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/42180631709.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/14584155430.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132309fc55e7---tifomimeponoxovo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/knbdvj4cm3ppk94731h22glua4/1508693717.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/29097738582.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/vukewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=art+of+war+mod+apk+unlimited+gold+and+money+latest+versionPDF 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_off0000befd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFD 17848 bytes
SHA-256: 6cc218e2b37ea97f8fc2fdcc01960464efc95f0c133c05cce1e6599d24c6c939
font_01_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 11280 bytes
SHA-256: bee43c724698b7e73e153f63915ac04f82c5e375cd8748679d4b76505ae59f32
font_02_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1