Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad461be7fd5cfef…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 16:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3dfde5a4ada400e5568b72a8399a5743 SHA-1: bf216359ed00c0e82b761e2b10e4e551bbd083eb SHA-256: fad461be7fd5cfefa953f1a207d6240a3382850986af0d7aa2b08c3874e9bdf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it is a link farm pointing to potentially compromised websites. The URLs extracted, such as 'https://irlanc.ru/uplcv?utm_term=cv+writing+pdf', suggest a lure related to CVs or job applications. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=cv+writing+pdf PDF link annotation
    • https://muachungbaohiem.com/uploads/userfiles/file/96919039878.pdfIn PDF document text
    • https://dellrein.ru/content/file/79777490226.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/kazejosepaguvijopum.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/tatomuniposi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614085cf20c9c---28024680259.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/raxudabugiso.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/fafuruvedovaraxedibob.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/7691889777.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/10289397034.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/20380714359.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/romewejegamasatasasajup.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/0ia6a9i9t1h3c6pmi33uli3jl5/gajugezerogagafuraxojiv.pdfIn PDF document text
    • https://service-panev.com/userfiles/kusowiwam.pdfIn PDF document text
    • http://schokofontaene.de/idata/zibogu.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/munojetemazeropefaz.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/96414828645.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/80242173713.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8ded4e4598d35b15e0fbe223e37cce36/wofumepixajifewaparir.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/44121659369.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01a279e80---vazifefaxutomajut.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/91618958171.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/88823842067.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/xomoninaliwelikesapetet.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/95959896056.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///disoj.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_off0000cba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA0 18012 bytes
SHA-256: 25f8a0cb520f96e748698cd8ba011f8b3f9aa2b183b70561c614e37ada943b74
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 10228 bytes
SHA-256: 2dcb9945d126a51d7fc3a1b6750e17c440c8444ceb2f491f1ade9d190ebfd834
font_02_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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