Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcac907a4ecfa915…

MALICIOUS

PDF

74.5 KB Created: 2021-09-20 23:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd7a661fb21ff4cc75ab8995c8623e2c SHA-1: 20f4aff100f79a6b70d5117f08b4e36b194a4f72 SHA-256: fcac907a4ecfa9159794ebcadf517861f63041b5845a1244e114909be1b6a90e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many distinct hosts and links pointing to disposable hosting or compromised CMS upload storage. The embedded URLs, such as those found in the link farm, are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mintedimages.com/ckfinder/userfiles/files/jubowixegodopulusemur.pdf In PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/8754615571.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/rakopupiluzofofan.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/78988001080.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/lumedidapivimovurofo.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/29485068564.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/mejewuwerigodusabosax.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/msh46452vfv6aml3gtpucn4vk4/wutajexupubabuzinop.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5afcba76989f66a5236072dde4267df3/5966425890.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/vuvesofusemafimupub.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/tuboz.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/pobiropozadenilaw.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/83143192287.pdfIn PDF document text
    • http://preiss.at/upload_files/files/78627272459.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/fibonowubelujuwirogapebo.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/losemogoj.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///75318256251.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/35111847633.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614898bfd6bbb---66007097145.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/39974843345.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/44709140687.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/25860197912.pdfIn PDF document text
    • http://baoveantam.info/upload/files/77589921212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=grand+theft+auto+san+andreas+apk+downloadPDF 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_off0000bf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5A 10820 bytes
SHA-256: d239dc68f45a49a1ae2df81e14d8634ba0c752a1d07d2529eac9d0e1cccd4e4b
font_01_sfnt_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 16968 bytes
SHA-256: e37b788e120de261eb52a5449b3a3007558afa3a30eed2ee2a5acbd4265e5c2b