Malicious PDF — malware analysis report

Static analysis result for SHA-256 118273ef901621ac…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 12:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8727db91c922e264a437b0398dcb4de1 SHA-1: 4e60fca0958aa396d0dadbc45ad229ee931cfd8a SHA-256: 118273ef901621ac6ec1879933737f79142db7b6776ac5f9aba7e32226c7e5b1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a142143c---sibadididawo.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141916eceb30---fixapo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/16f2717d1a1aa1149e1577a5c57e6c59/zawipaworalob.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/35221102449.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/gegisuxepuzifava.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/4894445233.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210910224925.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/8750121389.pdfIn PDF document text
    • https://digicpictures.com/downloads/7966637200.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/majalubejomin.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5dd36b88---42117850915.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614007a722948---70937997479.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/femelis.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/55433731905.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/jajozopedaf.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091002090173499.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/79181753074.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/pisikiwasepov.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/41146809798.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/ligixuvudafud.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/65098193612.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/kijuja.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa6c93841---kebonoxikurez.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/462cdf6de664dd0cef26afbaae922063/masigivobalexidunonip.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/51053202290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=simpl+pay+later+apkPDF 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_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 17896 bytes
SHA-256: 26b307d5e909a27a63ebcfea5e4e6c8c84f0a3ec78a841db6b87a6a6d478cc3f
font_01_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 10300 bytes
SHA-256: 57381eca58f23c7bfceda1ba3ff01d588b7e18909ffe732e10128889478e5369
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1