Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d90ff29f4f8977…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 10:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ac85869042c7f226fadbdb08a0da4eb SHA-1: ca243b007ce904c79a7414ddeb4187b8d2ab2f98 SHA-256: 31d90ff29f4f89776efa10197ffacce8f0f63e07510feff7d5ccceabb02da977
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The presence of link farm heuristics further supports its role as a distribution mechanism for potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=interruptor+termomagnetico+definicion+pdf PDF link annotation
    • http://kleinschaden.expert/userfiles/file/ruvewomepavometabu.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/59691426295.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/18241032647.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/v0ber0l39qg77elpt81lnk8g9n/zotelufamadawomujuxeziba.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcf25b21ab632496744a6f2ddd03975f/69213086314.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780d2e7afbf---zowejinexozabubunovawu.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/320323d4d3aa4bbb9eaeb5a2a6c4608f/28044229981.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca57756b3e---59673716027.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/49004601249.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/74339070285.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/20108993526.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/36637783786.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/polixixivokivoxowaw.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b0395b841f5c08d8867a7d56f83b9895/lubalokabuxam.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/028e2e897a02362676fd392ed768ec2f/jajetij.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/43425662039.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/xuxibekuximibabi.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/22651535041.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/68602753042.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/79276262893.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/51969489941.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/36630398813.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_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 10800 bytes
SHA-256: 03257528666e2a7bcc6d6edcdd31adfb2b3c21caec6cc64b39312cf2b299f05c
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 17184 bytes
SHA-256: adacdaa131b5e08df68d4c301db16e04bc38f0e2a939a91aa743e0ba5ba8b2b6
font_02_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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