Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c0751e791fd7ba…

MALICIOUS

PDF

85.5 KB Created: 2021-09-19 04:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6cfa81a9aa8055d643339a224cdc0c2b SHA-1: 090959c68ce05236b46d7cb3af4fff697a98ec52 SHA-256: a0c0751e791fd7bab3e31d20a01e147bec1472023192027011bc036042305bde
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially untrusted domains supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://tanriovermensucat.com/uploads/genel/files/forip.pdf In PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/69295516886.pdfIn PDF document text
    • http://101balkon.ru/upload/files/zilidu.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/torofukesomigepusesim.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/girad.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/nenidenibelubuzeligodutap.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3ddc50981e8a5a4334e5494fdaf760c/17330997316.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/jabilademolajenexizove.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fe347be4708a4dc7dabe908b979e785c/17018665368.pdfIn PDF document text
    • http://4darchitecture.org/img/all/vomadefujolenugabafug.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/213691e82bd363e7ec93220a5862c69f/97438950833.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segumowetademipezapuv.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/29571991740.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/31076455469.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/94828766014.pdfIn PDF document text
    • http://stefani.cz/fck/file/55197521286.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagelopuzuwebidarit.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/redebubowep.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xokuxozupizil.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911195514896985.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a410b65a31---jifibubej.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613502073034c---fakedowemoxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=flyer+design+app+for+androidPDF 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_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 10668 bytes
SHA-256: ba18457fb44c7ff7f308dc38f668c003c6e5168a79c62cdac1036c88b54585af
font_01_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 17640 bytes
SHA-256: 7eb7494d9d59603d8da92a8cb95e33a306905f824c5b76b0328beaf212f15e7e

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