Malicious PDF — malware analysis report

Static analysis result for SHA-256 043c95c57010021a…

MALICIOUS

PDF

81.6 KB Created: 2021-06-29 19:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abc8cfeef0bb565b239a794f9500e7af SHA-1: 151768801ed55d035b9ed5050ffdf63110fb72a2 SHA-256: 043c95c57010021ab9538c456aaa8805fe798d57d02b22ea21ffd320b1d59003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=kiss+x+sis+chapters
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/023ec5420234ee9186aa4fba36ff5136/62521683812.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1c15b0807ee3ff94dbf65d6755121c8e/68566672029.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0c7d844174c0a3f1f3b1a118e7603d6a/mafokoro.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/gikaka.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b70b787775ff7d59f998eba7a809b9d9/nisojosakarakuzesur.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17680719e2---26311457096.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/80af39d2b0930805d9769c2aacd9019b/49834007748.pdf
    • http://posekatzahradu.cz/files/file/76931130598.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/fvnjh2psakahd7i0fu5mg8sljt/xoxufezarugawafekobew.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51cba80a5---44050513433.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/tvlo36ipaaqk01sciecbvpnss7/59554804686.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/rebupepufonibumenal.pdf
    • http://www.deep2001.com/images/library/File/46034271620.pdf
    • https://biomedchita.ru/imeg_master/file/5248065447.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a653494c2---sajorusajazeveruzolafeti.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d02f765751593e894cbb2381d81465d3/43843505188.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e36bd94e13---bojufezejaxosigalamarimo.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/6e5ceb640e7ac500dd9144464d9329e7/1380847746.pdf
    • http://www.annaleehuber.com/content_files/file/zoxanokika.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2c3aa6b41667ed6041038f4befc61c1c/33159924310.pdf
    • http://strandedtattoo.net/file/43798728297.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tg0l3j0e95mhe7kjfoks86o3li/ratimolo.pdf
    • http://mikailang.net/userfiles/file/20210506182628_1675843776.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbbf.bin
c9760ab5fb3207b56ceab4993f96a7c9171959feeeac0de729e2aaf4c85e4d65
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 17564 bytes
font_01_sfnt_off0001085c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 16792 bytes
font_02_sfnt_off00012073.bin
6d33e0547b2275d999c0c36b3f7f6a48e3f122c6cfa6549fbf7946e7ff9a0245
pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 10292 bytes