Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d655f311fee7fa4…

MALICIOUS

PDF

76.0 KB Created: 2021-06-25 17:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 407d3f3946bc9a512d7e3f012f7d589b SHA-1: f7c21ab352b36e4ab7f854f6b70fe33059de94b1 SHA-256: 1d655f311fee7fa47f07dabfc48139c0798dac2fedbc1afb6b37d8c39c5479e5
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to external resources, including compromised WordPress upload directories. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://beastyenergy.com/userfiles/file/9267838962.pdf
    • http://thephinhmienbac.com/upload/files/rowofumufekokamipumupujin.pdf
    • http://amon-syotengai.com/userfiles/file/wefepegifalabusapixixa.pdf
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/guwizapisikori.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607926c6e4643---3296273999.pdf
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/kuwesine.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/fbfdb5a57cdda6dd1e946dee7fb2ec42/18067632976.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160951d7d3361f---nerabepexeba.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/1fcb40a6f0e1dd28f602e1fe45de7157/wokul.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a8de048b99bece65ff0759a6898287c4/dajevusifikuwufobonexuti.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf0a99152---tisufirisegaj.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93653259d5---46906309378.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607217d591b3a---jowovox.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f490eb4cba26ffaac0f6b72e4a58a370/mofolenixa.pdf
    • https://limmaginebistrot.com/file/fusokagazizotasuru.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bd73afcd90f60610cb5830fe2fb01db1/witifoludofobuvowejo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=instant+reply+message
    • 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_off0000c6b5.bin
6db8fc0ab3b4f3f5ad35ee0ae26fc4b0c35e1de12ebc1455d8035efe767f077a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B5 10448 bytes
font_01_sfnt_off0000de6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 16792 bytes
font_02_sfnt_off0000f681.bin
9ace770409e532ad838f94a9952ef818ffc55d72c42715c7be078c3a255bc0cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 17240 bytes

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