Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ad847b984ef204…

MALICIOUS

PDF

77.6 KB Created: 2021-08-06 08:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d77fa44a8757535944bea09142c67b26 SHA-1: 9428826dcd93a5e863baf702756072e831320302 SHA-256: f9ad847b984ef204a84e670f6bc0f59b508f3a87f9eb6e9ee4422e22d9139bfa
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute malicious content or manipulate search engine results. The embedded URLs are the primary indicators of compromise, likely leading to further stages of infection or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077557d7c9eb---tazojotenafudolaxenavo.pdf In PDF document text
    • http://aqbnb.com/uploadfile/file/5305591437.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/zukofadolujinus.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/960342889.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/13017940884.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c5c2566c6aaab10cfe15c8a27bddcb9/24669796267.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210607_3E144A26EA4F057A.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/96681869730.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/ribapiriletawu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vo61795a287aaj58thpq0q7ul1/jopolowef.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/togoget.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8m04vrkf6i22bf32q47qm7f39p/zokimiwoboguduvikodaxew.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0b40e8c19b31d9256479534a59b886a4/kosekomoz.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/344049962.pdfIn PDF document text
    • http://goref.ru/files/file/poteni.pdfIn PDF document text
    • http://labonscafe.com/userfiles/famol.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/kerojesujarujiwugexap.pdfIn PDF document text
    • https://airshow-bg.com/file/51973103608.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/fasikexoxaxegena.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/c9s76p2fhcov58dvo4471atfgb/98877408441.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/of9jaolcg8hbioqqbvgqt6n6v0/kamikem.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/dazuxu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735b15072e3---riboxukabugivimedit.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/gedozazuvegige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=rival+electric+food+slicer+model+1101e%2F5PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 17064 bytes
SHA-256: d975ed3cfc8cfc856507fb3a9b969d0310f1d5c0670336eaf31431d7483d22d4
font_02_sfnt_off00010023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 10988 bytes
SHA-256: d0e8e41a190a872368b20774354a3d6639d603d6ec60626b692462802d157de6
font_03_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4

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