Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fb10f7b80d712c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-05 07:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cc38b9106695290152c2934ab8de6df SHA-1: 1b322e9bd91db6beeb18ad99bdf96c3afa304411 SHA-256: a3fb10f7b80d712c656c40619763ae484aca57736ce64a2e3c4dc61d342ccb5d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external PDFs hosted on compromised CMS uploads and disposable domains. The primary goal appears to be to trick users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://synerhu.ru/uplcv?utm_term=el+xilema+pdf PDF link annotation
    • https://expomediainc.com/upload/file/25540892823.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/63736837191.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/sanubijiveretogelugerefak.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d265aa2d8---71028884253.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c4152336e1c53feff05ee0b5df9271e7/72833858063.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/farifatejafusutaza.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe3121c21---64559125596.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/97540170749.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/t1bnims707mq26lu933dcfghdq/jakegukomugepug.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/wozolutadesuwetunavuxeku.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210804222759.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/kedilezetem.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/21766620044.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/26787620730.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/40834896323.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb6db407e5---jarinamenozukopusud.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c85cff0418e---midisanidokasetona.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e61874389---zubareragubitamejidizifi.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/557ed2597811ab89f6764dcb60247b68/85275606628.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/makekigusalixilesojavijab.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/89735137478.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/40540396247.pdfIn PDF document text
    • http://mlight.cz/archiv/file/raliluwulizejivujalafep.pdfIn PDF document text
    • http://flexa.cz/docs/file/21642253801.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_off0000b5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EC 10156 bytes
SHA-256: 1dd4ef5136807f765f52358fb8e1d405b93d17b4a9f31659a0170193e1625c6a
font_01_sfnt_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 15484 bytes
SHA-256: 95d24a7ee42e9a04d1638db7000394e3c9cb666d5078957fd7b745c65338fcfb
font_02_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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