Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bd242d749154cf…

MALICIOUS

PDF

86.5 KB Created: 2021-06-25 15:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54bb21b1771b6030d90d37bd7fb99edc SHA-1: 65c7ff8b79ea4d9bf45a63726680d55b4d742c06 SHA-256: 71bd242d749154cf535cf024c846eab246dd83f4a3ecf7d18e1b9721b3dd8ea3
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The file contains numerous links, with at least one pointing to a compromised WordPress upload directory, suggesting it's part of a phishing campaign or malware distribution effort. No scripts were extracted, but the presence of malicious links is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160880457b183b---82767183242.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1ddde205b2d6ee0d560566c69f645082/68088600251.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/idvirjtnn2ho9ba2i8h19vk6ua/bixoxexutufolizawur.pdf
    • http://rdmsrl.it/userfiles/files/derawapilozejisomipegokug.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b10fa19836a---76665833128.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/672a8012a31020bca9de0e2a8cb7962b/73751024865.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607712b74adb1---wumusidapirifojofesazix.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/61142904625.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959b910c8a5---dumezatimilitopifitefevoz.pdf
    • http://dobrasekacka.cz/userfiles/file/jemuzatuni.pdf
    • http://ahlhy.com/uploads/file/112217134128.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/h85c3nsoi9k80hegj0jpa68rfe/22922023979.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfa84c8f7d---3982009702.pdf
    • https://777mto.com/contents//files/92586594876.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f598ba6e7---41430254323.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/88e3f57cae6ada338fc25dded4fc940e/newubopavakamopofamab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+concentration+in+science
    • 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_off0000f0d8.bin
993f1bf922dd18eb860d3359ab3cb5bcf54086e9957b7dfb70dc2d7ebd361117		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 10460 bytes
font_01_sfnt_off000108b7.bin
9cb219f9db84a8b7d25d97208213c519703180e1c680172f1d3176917408a93d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 16944 bytes
font_02_sfnt_off00013501.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13501 16792 bytes

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