Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89686cc45b6c032…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 06:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9a08a581cefd51c6a173c843bdfde96 SHA-1: 5a1988e1534250a44d8e10b9acc2b41a3ae5508c SHA-256: d89686cc45b6c032a3f75b11274658e833566555de5572154fc155df71bc9c91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded content indicate it's likely part of a phishing campaign, potentially using social engineering lures to trick users into clicking malicious 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://medvor.ru/uplcv?utm_term=free+movies+wonder+woman+2020 PDF link annotation
    • http://happyland-nsk.net/ckfinder/userfiles/files/tametamigiwejuvamixa.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/rorutigerubapojevutowuxi.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/4443107601.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/gurikonurugalovugopov.pdfIn PDF document text
    • http://firegallery.ru/img/upload/kolunavupapapana.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614553bd45d15---50729507300.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6a9c824c808ac4270c2c0fce9c19e0ce/tatefokabulus.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/zipik.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/57642431ea93e5333c7123ab7fac40b8/kijelepizobagugaxori.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/kezagagaxobivevu.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/vumowinilazedesutuxu.pdfIn PDF document text
    • https://tcremich.lu/files/files/buvelu.pdfIn PDF document text
    • http://htwy.com/upload/file/18568274283.pdfIn PDF document text
    • https://heyratacademy.ir/file/14566267672.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/fadosufijepepelowoxi.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/xewukeduwiradopi.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/35788758453.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/nuwifawepinaxazabugivaseg.pdfIn PDF document text
    • https://noventa.cz/media/files/file/porufosud.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/94201441311.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/kufewikatimimevarojugowev.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/97167622593.pdfIn PDF document text
    • 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_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 18072 bytes
SHA-256: 9b989b7f43f5ab48762655054706534242f95417b0b698fd0f25603d9bc782fa
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 10636 bytes
SHA-256: 127b18e8bb7f8017b48b3d5aaaa7972a8ee1ba6655323c5d7006d1cfa5f8eebb