Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8f93bad43b7a17…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 16:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 642780eeef21b976549916d5620d9349 SHA-1: 61dca3c1bb2abf124422c0cc43a83cf04a138766 SHA-256: 8e8f93bad43b7a172cca766d3b2764e830515c9ec9073fb4ed4d6d47f48c2b99
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://aquatrustfina.com/userfiles/file/gubatikowedupotipoderibe.pdf In PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/33442794240.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/cb3a9t9kl6lrk3udoa57qtq8q0/70163622487.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/59436395008.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nazijumipi.pdfIn PDF document text
    • http://risme.vn/files/20267272795.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/33889858099.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/69353840956.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/llstotot6kt74jnr0rmf1ttlq2/86658240344.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/gamilipofisesazew.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/20531118866.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/13980178542.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/mogawasawezolexapadufero.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/ravipesuzinuwupigos.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/nuxemuvibegaxozox.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/xajezuzusogipadero.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/29086355224.pdfIn PDF document text
    • https://nattasampun.com/upload/files/ginuzetigixonuginokug.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/pasubelezimixefobun.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/641cbfe6b344cd95153b3735e6d94f2f/77345392602.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/tilutajejufitolot.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086023947194---13026613286.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/65778659441.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/3insk78ks2dtgni47cb7g6qjq0/xusijimu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b6058824f---zurodenuzajibeverazigareb.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/96256581867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=addition+up+to+5+worksheetsPDF 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_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 10672 bytes
SHA-256: 9891aaf7cece5d5fb5baba9895f1d89969d6f309c1ffea1e5eac728947bea040
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 17500 bytes
SHA-256: 6f7d4db71d3c8bb251f6b3c98e0f90a2ed225373117bc3e292d7d62176a81d29
font_02_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1