Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc22fb9e77c7c43…

MALICIOUS

PDF

91.7 KB Created: 2021-08-17 02:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54b061e9382e857780f8d39eb508f822 SHA-1: 9eef749f7eacc02cff3930585f2d44519d7b83ee SHA-256: 0cc22fb9e77c7c435c8648c1119a88129397177035c4575995d4663fd937a5e0
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2e5e8e8acbb6bb46046bc1e01014e57b/xinatikinaxugubififej.pdf In PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb784eba78---dakubijepugokuki.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/25731816813.pdfIn PDF document text
    • https://ecoretras.com/file/baxeroduvilerefab.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160743ab538d97---33526396857.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c78f2297823302dac65296cdefc9b73f/suxuvunomuruvurevareva.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fd4f13b6b---13623562723.pdfIn PDF document text
    • http://thedreams.cz/files/xelizigurivovimug.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/86854588730.pdfIn PDF document text
    • http://gabortech.com/admin/file/2247484808.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8ail2479ivvrfoqm12u2spr32l/31012709272.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160835e403c1ed---23593694072.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e917985d28---mukepabekewakogopirovan.pdfIn PDF document text
    • http://bjallstar.com/upload/file/negolojafixaka.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22e7d3985d---juribomomawaririlemu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77bcc51289---64160216765.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/gonuzelexosebejok.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/asl6or5mu07k5njcdd5i0qjg8v/dunivomutonotibo.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a637525d791---wepotamipot.pdfIn PDF document text
    • http://seamacros.com/upload/file/xusizanagikexig.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/27a49849204338105ea80b16d03b3db5/somudi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3eb201f14a9b32bc4f3697a01b9feb71/lulewoxezekogulivipaj.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/zatuximef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+cmyk+for+rose+goldPDF 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_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 11016 bytes
SHA-256: 828e854872c733455b18ab878bb34493eb8699d93da3a68fa941dd39ab1dd9fd
font_01_sfnt_off00011ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 17008 bytes
SHA-256: 0757925b1aac135f976885f6f7ea9e281e720e41172f679a7a61348fbce89e1d
font_02_sfnt_off0001492e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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