Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64b1f3a1743467f…

MALICIOUS

PDF

90.3 KB Created: 2021-09-04 00:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 408cc5c3a9d73fe3411c5bd7248d9ac3 SHA-1: 7bd391040417f0f2cca3c88932fe95c7f07b2bb3 SHA-256: a64b1f3a1743467f74e680c26e75ff6e1f7eb65bfe8ac850206f1e3e136da9af
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://philabc.ru/uplcv?utm_term=canon+ip100+manual+pdf PDF link annotation
    • http://www.scsk12.org/policy/files/files/lolupiviborenevaz.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/bepobowonukibibulara.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/5456886456.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/81759843291.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20f2abe64---nudogi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/083f08221e9ea32b7205f3c8c89a5084/pawuviw.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/58fdda702865de8bb0344ca074e2566f/59526959150.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed76717ba6---vajanoxukolakotokipig.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/bopixifo.pdfIn PDF document text
    • https://egf.tw/test2/images/file/82515365969.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f97a8e363---92779039867.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/njujus3k5gt38h3c9dn458m4nj/30302125283.pdfIn PDF document text
    • https://faceless.me/userfiles/files/pefufijebomos.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0rl1ddgtmbikvti7taqadg0nh5/81647771970.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091b79aa4f6e---luvavexetukoxenaveduri.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fdebf893ea8---vizokiwagusezuloxigos.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3203a91cd---bulozesitigajorawoxem.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/91705774837.pdfIn PDF document text
    • http://guchen.ru/d/files/nefuwumuligijixe.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/molij.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/bagadeguluxek.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/50349625276.pdfIn PDF document text
    • http://school15-tyumen.ru/f/15920682800.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd38980ad---66251970674.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe77ccb696---marekilixi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c92093945---91027934316.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_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 18028 bytes
SHA-256: 13b47f28c09d02c1392b7cbff2b3be15ff9a1579606f2e8b6e7b100738d31390
font_01_sfnt_off00012b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001436c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436C 10464 bytes
SHA-256: 53cf096a7b078ae82be32e9dde188b86b6bc07705c78d74ac909dfa13cc1c279

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