Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcf4af7e8d52eb1…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 11:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8e621fd58826f1a4fab27187d19c4e6 SHA-1: 645b55461257041e6ca73fc68d342332d432bf7a SHA-256: afcf4af7e8d52eb1212d2b5825b3e4f60c86112b9e82b868be8e1121d0b17043
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Heuristics indicate the presence of numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://investbuild.ru/var/upload/file/pelaxowemimanalekozi.pdf In PDF document text
    • http://ekotop.eu/userfiles/file/dovulipowi.pdfIn PDF document text
    • http://bluebossa.pl/files/file/25679991398.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/16558951500.pdfIn PDF document text
    • http://chemsdano.com/upload/files/xesojifuvemosajaniwomopin.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/93558189107.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/460d6a54140f0cc2825964daf502ac34/47680876848.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/94248510919.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/96312557999.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/goragasurasubojiredira.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613501c494fd2---polifevuzefom.pdfIn PDF document text
    • http://esipro.be/userfiles/file/22137436164.pdfIn PDF document text
    • http://abpaluso.com/upload/file/79166302157.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/7561391409.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/82754057350.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/vajutibum.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/9fc5cb524754542ffd944dd87e7d294b/98352423617.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/89731732096.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/23496294950.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/3064134155.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/62264818842.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/ratuxanak.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1612f18ae32d68---tapufapijumalumixapum.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/14686904895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+boss%27s+daughterPDF 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_off0000cd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 10520 bytes
SHA-256: 395277f1cd1a8cd4e6ef580a799b876bb7365f775a3729464a6bf0fdbd33df06
font_01_sfnt_off0000e533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 16880 bytes
SHA-256: ace3977629bb37e65655221c6d9a7bd1627e4e1395005290fc997315616cc499

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