Malicious PDF — malware analysis report

Static analysis result for SHA-256 646ac43dc1e21b53…

MALICIOUS

PDF

75.4 KB Created: 2021-09-03 21:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d6009360f81db4e437bcda9e4f118f0 SHA-1: ee1b9f7c5bb0d094e26cfe5447638824bf11ec90 SHA-256: 646ac43dc1e21b5386efb47f5956a5d62a2ba543410a0010728464b20e364b31
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9d97ac6d756bc240d1a208a2db71a486/11973795108.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2d726b11---54184441102.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/mazobetuli.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b13e6752e---gatonunuvomasubazez.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1670f51f40---fedivudukokesipolewavot.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/norajulamexofisin.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/74298828894.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/nakujalubeg.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/wusiroxifimiremutisifava.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/3313426373.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210630120845_k5f1yf.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72557f08ee---91875328584.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/eeid07h1i7ftrb5mh4kr7art9n/71750653151.pdfIn PDF document text
    • http://esejsc.com/upload/files/tasubotosifamonep.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/mibubameruxominibujurafaz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ab0bf12cb---nonugukowedibelizuxaguse.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/92945388751.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/03515f550e0fc7b9c61c73d70e801429/46060526478.pdfIn PDF document text
    • http://regmac.net/userfiles/files/zidusudupoxodokami.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/nawaw.pdfIn PDF document text
    • http://fxmeat.com/upload/file/c7f3b88423b31c39009c6da2ca9a53f1.pdfIn PDF document text
    • http://abworder.com/uploads/files/99548465747.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/susinimowu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ekojevsop5tdu4jdtct6uc8ih7/75573803457.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612c0472c5bda---remosesefajofog.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/49991697382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+todo+pasa+por+algo+descargarPDF 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_off0000c00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 10600 bytes
SHA-256: e3a78733d1e41d969dc30d15c64b15efad370bb541f67717ac1c6b9c57212652
font_02_sfnt_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 18572 bytes
SHA-256: d553b8c0f1ca1dca7cabbc875ee2409bf81aa07185bc7089d68af6a02577b332

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