Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1037c95b914f8cf…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 16:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d1604aad4e8575f7bfed87c7e7d65cd7 SHA-1: d31900c891d5707b1853c0dee1c4039b9ee86d21 SHA-256: d1037c95b914f8cf56c1ad7419756cd24a0b5b74258907205b74c8a7e1280be6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites, likely to distribute phishing content or for SEO abuse. The presence of external URIs and the nature of the links suggest an attempt to redirect users to malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/phraok09dhisb4dqdsm83e49a7/52681691894.pdf In PDF document text
    • https://sentinels.ro/userfiles/file/mavupigavurokagiku.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0d29db297---famemusukabasafudofumexus.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b664d01f685---19711568127.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210819034746_133274402.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/ligepuzazotagariwizilani.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/gebifukirobikoraxup.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/15315733070.pdfIn PDF document text
    • https://equalland.com/uploads/File/gurewutukezexa.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/gifefalasugoli.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b01cf2f6a6ebfbec97db531dbc286209/zoputefelifudepadarujiba.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ef08edn4epc1rcpakh8sc6k9oi/95474084456.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/zamomenuvukaj.pdfIn PDF document text
    • http://www.pilartangguh.com/file/wedinamaduvokiwopavixik.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/25740319316.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1354564cfd---toxogepewipamosuwizis.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rhqnvola4fndfn21fhs0f9mml3/98221807750.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/lizoguruwuva.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/fafedegojinobolokoboguli.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/pizepizekit.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/pozuf.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/513198e7808fba96e20f3beba4ee986c/57460623259.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/tevuroxe.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a26a1ab3a---marerojufilirasazafodero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=least+cost+method+example+pdfPDF 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_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 10648 bytes
SHA-256: cf927451171061981662876dad9111f73804801fe7899482d97b7bdd00215c32
font_01_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 17568 bytes
SHA-256: 1761754a22d34f7275979d81df60ac945039f215ed90bd723f05e78f5681b81c
font_02_sfnt_off000118ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.