Malicious PDF — malware analysis report

Static analysis result for SHA-256 2325bcd5bdef3521…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 17:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: cabd10fbd758ab81def2ea78710ec5ee SHA-1: 046355671e375e119851a31309b5bebf20048655 SHA-256: 2325bcd5bdef352138fc28eae8bf738179327130520d701f610c268b7ba5849f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and link farm nature suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee14d61b6ea---zitunadunoxetatepik.pdf In PDF document text
    • https://norservis.info/files/files/revovar.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/73035295b00651cdaeb0c758a18ef2aa/xukadugobazune.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/35489353061.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/26504860097.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8bffd21ea87ff1a1e59e00d2a6cb0750/tevivopu.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210621033211.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610c04080e24b---zavadidimixegesukomokel.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210820_E981E9B6D081FAA3.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607286fb90050---93669060086.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/63036751947.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/xebipupu.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b48e460752---juguvolurogifefali.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fo0aua97tkbehoivva7ie1e7oa/wubividigi.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/bd2e8fa62ace090f00bf5b5c2ed04c6c/46867367788.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09d04f0c7---xanufame.pdfIn PDF document text
    • https://actor-conseil.com/files/file/sozetujo.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/latudufire.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/6425923655.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c0686159c52---94972288147.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5911cf36---wokur.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ioknrtfkfeub04066cpucesucq/gonajogalofenebabadegu.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/2932605179.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/292019422928.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/s4fo8a9ad9enrfqi7b5gfacobl/mexofefuruzakuzuvajejofa.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083553fbfbf7---sakexemogurijununazip.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d9015f32bd17289e65334acc180b22e7/32449924245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=difference+between+few+and+littlePDF 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_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 17448 bytes
SHA-256: a3366299354ebc0181d8c6c99562e12f31bdddfc8796d813a4516f00808748a5
font_01_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 10408 bytes
SHA-256: 3c0e2c4fa0a13fffaa554edaa7f49056a0054a1005fba8cd560d41292be95959
font_02_sfnt_off0001218a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1