Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50c01618e22d14d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 05:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 820b24111b537705ffe906e540a8332d SHA-1: f2576fe40b829a404b3c20e092af8ec14d42445a SHA-256: f50c01618e22d14dd8883acdd26ba9e6006ed268031f587479b06af64968a59e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of numerous links, many with UTM parameters, reinforces the phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pwr-tech.ru/userfiles/file/gedotitomudebatelegono.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/48b1c86b47bf79e0e5b69e1b750fb4fc/wijuzikefegititaxol.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984fb250e1e---84051552810.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/bazuwinivuxe.pdfIn PDF document text
    • https://pecsikult.hu/files/file/wizul.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820b0ae242a---96264526915.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/23368528806.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/74091623590.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/jetejazowuridegubogar.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16093a414b4f0c---1532757385.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/mulevalon.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3215a1e1129831d2ef7a4a7049cd6a17/lamepid.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/lomojapajokili.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/351851723.pdfIn PDF document text
    • http://unsersohn.ch/images/file/14769718051.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/nigozokobeguganaf.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4b97e59816beb6ca1bd69d7037f99b6c/16224745763.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/rf6v6do76rnvc55qa36bgsjmt7/74796707372.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/wejulifejipakimo.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/42555939161.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd35ab20ca---20721850150.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/766b9b7d4a32a66798bb546e32f7dad0/wojipisonawevudogekajufun.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/lozejajopobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=geometric+probability+worksheetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 18352 bytes
SHA-256: fb10684a095a4dd1aaa9144d9a84259b7c462480ec01b5df266b123e3fea1b6e
font_01_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12941 11004 bytes
SHA-256: 7d7d81c449497d6c8cc15b08c64e1fb5bf550f0a91d5340bb32979c327555301

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