Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb45f0805c1f008…

MALICIOUS

PDF

75.0 KB Created: 2021-09-14 09:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b12057d8d8debc941bef47dc0e6a98ca SHA-1: d97179e7109c7d42051df7295b2fce50360baf84 SHA-256: fdb45f0805c1f008a2139a2fe775179208d3320fb56d7568653e5ae4715938d0
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating it is a Pdf.Phishing.Trojan. It functions as a link farm, with numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://actsonics.com/uploads/files/202109140605301267.pdf In PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/54115809362.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/muvipix.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa073c47f4---misovox.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/78215213153.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161302d5b55652---selufewugoxejewuxujojin.pdfIn PDF document text
    • https://arerp.kr/data/file///xusiv.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/liduledapakimugesireluj.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/fupagowumenoledosixedefax.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/82666652852.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/rovedobukoxonibe.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/6589828532.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edfbdd4acd---43736984648.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/valipivovutiretotivare.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/85538417971.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/75875200684.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/duroratoguseso.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa46fc9fbf---rewapuk.pdfIn PDF document text
    • http://isgsrl.it/images/file/vukutazuroliwuzowagufidem.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0f369284---mopazelunagevulor.pdfIn PDF document text
    • https://eclearusa.com/images/file/doropumumedorale.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/kesiwebixo.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/lafejizotenoxu.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/02b6c963e11ee897aea7e7b127fa1a83/24604794438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=harold+and+kumar+go+to+white+castle+putlockerPDF 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_off0000c023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC023 11228 bytes
SHA-256: 11cc404cdf6407970e067bf069421906d5badcb8f0cc5a22c068db8b729d6e8b
font_01_sfnt_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 16888 bytes
SHA-256: 034212ab5c86d6c688e7ebecb22e0f15e5eba45f29df1880bceb30da3ba2ff71