Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9014ffba486544b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 11:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 88bc6df9ece7af0cceb098ad5ebdcf80 SHA-1: c581a1a685c82b1d32d39ac215a8d913c6155293 SHA-256: b9014ffba486544bc66d430522bf8472c799a5295a46dda85887b67c8a3c9848
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest an intent to lure users to external malicious sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://photopoligrafic.ru/ckfinder/userfiles/files/32141708234.pdf In PDF document text
    • http://pronobile.com/catalog/file/mukeratarikarevagi.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/2838729520.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/zekikivemutatifow.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/17158011261.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/47650274262.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320c35e8a4f---39341088485.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/tewanofexo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/46a6a7e2ec086c9b377b9368f2555b08/18131032737.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/mikimekapujijiguresa.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400c7bc0986---56344777276.pdfIn PDF document text
    • https://deepex.hu/hirek/files/rozetemamafenesoporu.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/dageridazajixemudiwobir.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/78036744126.pdfIn PDF document text
    • http://hoachattn.com/image/files/netoguxexewexewivupa.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/57692633826.pdfIn PDF document text
    • http://blgjad.com/upload/files/51490986929.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/padugujavigagesesuzo.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109160835078243.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/zeduzusunovod.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a00da110---55941155467.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/26903167040.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/63831130844.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/90096455617.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/15168572622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+music+player+for+android+without+adsPDF 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_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 16596 bytes
SHA-256: dcd6509b6538d3d2ffbae8e18ed71267c789511f1c44080085195ce523cb7b7a
font_01_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 11236 bytes
SHA-256: ff3f4acb8415f2b4ff65247b077aefc8892870fd3c4504f1adb18e37842859c5