Malicious PDF — malware analysis report

Static analysis result for SHA-256 07dc4b41b0da8f43…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 15:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97d181a7dd9d0768d73531fd0c87c92c SHA-1: 20539f889e4780ceb91ca6f8bc29290dfa5e1918 SHA-256: 07dc4b41b0da8f4368707cc8126b15db62f03d1529a142dd32f61802ad146685
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. ClamAV also detected it as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. The sample likely serves as a lure to redirect users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8ae7cec5---55934803008.pdf
    • http://nawoo.net/userData/board/file/85322655229.pdf
    • http://kprmk.pl/userfiles/file/74650207751.pdf
    • http://ck-buhgalter.ru/userfiles/file/64445037518.pdf
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210903_132355.pdf
    • http://contelex.it/userfiles/files/zuzisufe.pdf
    • https://okazdedziecko.pl/_files/Media/file/jasuwe.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/85476284789.pdf
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/76906496470.pdf
    • http://abwwilson.com/uploads/files/dafeva.pdf
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/560602077.pdf
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/fijudakagow.pdf
    • http://egyptlance.com/userfiles/file/woleriwagufebinolugefi.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0b782034---93558843487.pdf
    • https://fobh.net/userfiles/files/ruduzojusenamikekofuwime.pdf
    • https://aymfly.com/aym_image/files/47352404940.pdf
    • http://cuboni.com/uploadfile/hong202109080301517635.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/82325979867.pdf
    • https://vili-al.com/uploads/wysiwyg/files/sivesobad.pdf
    • http://oshcongregation.com/userfiles/file/keresizafidagidogi.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/aea78518524c897cb7ad402a9e053877/32915521834.pdf
    • https://holycrosshealthcare.com/userfiles/files/robilofazotebegog.pdf
    • http://mini-garden.ru/userfiles/file/vomumofewelipinepegim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mine+blocks+play+online
    • 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_off0000dead.bin
05bf36bf9ff85521841be7ad5e0003ea2c6f9f744389fc4da5cea3e209677e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 19224 bytes
font_01_sfnt_off00011110.bin
58206f10acba56da4ce7f29aadfccf52335dec529931e09c92f3c05e76b794a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 10508 bytes
font_02_sfnt_off000128e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 16792 bytes

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