Malicious PDF — malware analysis report

Static analysis result for SHA-256 37735418a9a32ad0…

MALICIOUS

PDF

115.9 KB Created: 2021-09-01 06:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 867844492e0f8a4f7f9521ec6f001837 SHA-1: ac335f0945691fe51b4a65e0731c5767e2c14603 SHA-256: 37735418a9a32ad087334945e971bfd723dc5a147b76e006ccd870b0da341473
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF payloads. The primary purpose seems to be directing users to these malicious URLs, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcfde33c72c504cd688b3d0bf48616f9/garewepivaje.pdf In PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f532c22838---27498858566.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e82355d75a5---nozerekaxuki.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc0d80d3f---sonepofetetasadijope.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7b0c2d08412854d4e2f23e4443a79861/66403036300.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/gajiximogozit.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6833d36a43---35055677160.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/nijonivisifuko.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/34475292557.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/sqfb5lni7vpued9ukm7us7g3j7/31279689966.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3882aecb---2733893415.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3a814944c71b210f076f81bca6634f93/41980821510.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160991fc76f421---moxexusuxewi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f36abc28b39---tibiviwoniperozezofimu.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/34079186726.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/8474925749.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161185663cdead---20784067005.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609747a679035---63166949830.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/42693710459.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8b978e63d51d9a8e512d1301b9699416/46870544473.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b5236fd6---libuwakebugarake.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/hvvkqnoj20p4m43j2h32a6l70p/4351819403.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/39329180403.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f544f1e3486---89249123858.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e7ebe274---81765906566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=central+states+debt+collectionPDF 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_off00016088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16088 18876 bytes
SHA-256: 00ab1b360695cb8a7d4a0485e3045260b474e42221b688f13d2dcbbcba3b715a
font_01_sfnt_off00019183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19183 10532 bytes
SHA-256: a49c6a3a032498ddd7c9cf1910f11677313337cfe1e2ffb8118ca60923b3bfb0
font_02_sfnt_off0001a99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A99F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1