Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d9c66c18461a1d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 20:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49518ae9d042abacc3f526e4cb3fbdd4 SHA-1: 9ab27b207a15f69830f355150cc63195dcc8233a SHA-256: 24d9c66c18461a1db77dc25c4f2c599eb361ac3eb2be0de5dc2e4539769b146a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm structure points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=ordering+fractions+decimals+and+percents+from+least+to+greatest+worksheet PDF link annotation
    • https://fnb-concepts.com/images/uploads/files/xuvuzedodewikeja.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d0a6bc59---lewoxutovimi.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/sawozuvilon.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/zefanoravekiriwuxoxovija.pdfIn PDF document text
    • http://myqself.com/upload/files/75576929019.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/sefefolaxexusevu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///nepajulifawuwe.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/91398077537.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8b68b3af6---98989125191.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/boduzutokutim.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/99569834555.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607484fa5d3cb---57555688261.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16121bed0ca43c---41422789343.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/mirumulibefesiwapip.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072c471ac9d7---pemag.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/08/04/gojasaje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eefe54704f---xikejijixugetupobivos.pdfIn PDF document text
    • http://akademibt.com/resimler/files/sutapenemitajav.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f73f3b7b---serunusugeko.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/93109434573.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/xajizudon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a197bea91---96658928357.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/53357513148.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/15674007303.pdfIn PDF document text
    • 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_off0000d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 11268 bytes
SHA-256: b8f1b75a509644953a26f4110403f8caa46dfad06e5e2076f2c1a159a5238d57
font_02_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 18288 bytes
SHA-256: 7190435dfe66c6dcf6c84e06e024eade2d2d8f5a83a8355a840d1aafab40ee7b

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