Malicious PDF — malware analysis report

Static analysis result for SHA-256 44520c9c056fabba…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 12:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88347a09f84a535d7ed83f6d1afad106 SHA-1: ff34dbead77752547e7b6624dae81aa6ff152526 SHA-256: 44520c9c056fabbaa84e7c291d109d109eb4b1c90bf449a038e1a4942e2289fe
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://agrilaui.com/userfiles/file/16246479797.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab33590e8---94631080880.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b44lmv50c4ckma57oprmupdje5/33746618288.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/57649f174be43388c8f792bff578298a/97627728047.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bee52d532---72453875906.pdf
    • https://stradatextiles.com/upload/ckfinder/files/xejejejokobikigebidoja.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/4fb4b8dd3e48b6c831d4bef0be9d8d70/87553952804.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/1a85cebb6af62850388b83aed699f17a/93323048112.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d5004827---zegulegukukobexumij.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/41238726258.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/726df02bf3ac0ba5f04b9e93b1c79f94/52756978959.pdf
    • http://linkingpeople.info/userfiles/file/47332154467.pdf
    • https://siroyensao.com/upload/files/25081298668.pdf
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/82778248475.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e2b02f38db2694eda508d7a2579a8aa3/vuvazawoxofakowej.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/52396c2f02fa04a7fb5f4d1105ba2d8c/widonavox.pdf
    • http://absolutelyneon.com/userfiles/file/wekupamodazapobowi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ganglion+cyst+pressing+on+nerve
    • 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_off0000ec4b.bin
90b275218398013d593c36367aa3b468855eba662e0df1ef341682cdf697961b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 10768 bytes
font_01_sfnt_off0001054f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 16792 bytes
font_02_sfnt_off00011d61.bin
a6462b3968549fcfb5713e5fb9b3a431b6d5eb33317124b7ddea6e04a75fccc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 16824 bytes

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