Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d9e3fb4289f761…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 04:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4336cd94091c759559a5482b41867ca1 SHA-1: b6b41a11796d3ee0663e4cbd5b68543fb91743d1 SHA-256: 45d9e3fb4289f761395e48c9c73175db8682dcc8ef0a7f6124f5a36d3577c902
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://gyn-ordi.at/myPix/file/62957762584.pdf In PDF document text
    • https://www.profiemg.cz/upload/ck/files/86635812460.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/11458074351.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/29679936923.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/78530789152.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/13088487837.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/kademafupufisete.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32432286888.pdfIn PDF document text
    • http://orthodoxnews.us/file/35056579710.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/30198135503.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/woxibozop.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e5284839e---19044097491.pdfIn PDF document text
    • http://teakdeck.pl/files/file/94501395335.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/nigafe.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/refarovedikirilegine.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/18384450087.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b37aa97d9---kewifozob.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/57362681550.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/87203648643.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210910090454.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/wavuwatukuru.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/87163081101.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/40168823462.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/5791328141.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/busevodatomiwifoxeka.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161370c217676c---mexagidefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=behavior+theory+in+health+promotion+practice+and+research+pdfPDF 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_off0000c0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A2 16432 bytes
SHA-256: 15fde38ff3e77611c5de4eff900970ce89f2f26b9fc83bea2d2d3625ba3160eb
font_01_sfnt_off0000eb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 11120 bytes
SHA-256: 90e9b7488986683fa7ecf16ab5b1f5fae28fa5e7c19fa898b95abbb53c4729e6

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