Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c99639d147ce15c…

MALICIOUS

PDF

88.8 KB Created: 2021-07-04 22:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5adf4b242494aa56853be23eec48e7dd SHA-1: e8d1fee68387b745828d947e808409348c61a80a SHA-256: 4c99639d147ce15c716bb88bf87adc57f3808607fd115d330dd4b6d7d8dad7e9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users to phishing pages or download further malware. The presence of multiple external URIs and link farm indicators strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=when+should+i+start+walking+on+a+sprained+ankle
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/supopinuvajutuxagi.pdf
    • http://nicenpos.com/userData/board/file/99222234664.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/e7a152119fe17ce431243ba3026b6c61/35241510823.pdf
    • https://aquafilling.com/userfiles/file/63308842701.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cc83ee25e---13418798515.pdf
    • http://chroscina.com/userfiles/file/4824529949.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/726948fd6f92f52f25babbd611d2377c/pesojoribepepuzewavoza.pdf
    • https://parklanehotel.asia/userfiles/file/21908465510.pdf
    • http://jikaramen.com/uploads/files/panexadugabanopirenimuge.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a4dbf37f44429666413d68256114137e/lomewizax.pdf
    • https://hansenlight.com/UploadFile/files/lemapafip.pdf
    • http://aylincinarli.com/fckfiles/file/zinajaxubaxakiwode.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/8cc3c40e0f0184fd382e2181cbe80508/4070171577.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4023e9c99---jalamufuf.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hfavf68fdntns7sjvsc6av3hth/norejeliderelipaxizaruzu.pdf
    • https://brs.jo/userfiles/files/82886284370.pdf
    • http://michellesmithscott.com/clients/36670/File/ruvotedidorofepixisanas.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de1697a1b6---mivukepi.pdf
    • http://icmasistemas.com/userfiles/files/67572741171.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160822a7d10165---laxenilogiza.pdf
    • http://apvn.info/userfiles/file/37802094441.pdf
    • http://conblocmanado.com/pics/file/fugamol.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/h5pvnntsnqgs0a9v0q64vqiaa3/sizafalefijuwifujelufab.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086610ac8754---14347330009.pdf
    • 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_off0000f6a2.bin
f54cc715f5915fb490252e0db4b33722a1ee4faa59db4b1ca53e428d1315ce8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 10940 bytes
font_01_sfnt_off00010fc4.bin
a345b4382d76c69c66220979b568ca53b97213275514c180bf9f69e16e8ad767
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 17564 bytes
font_02_sfnt_off00013dc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC8 16792 bytes