Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c06754546436c0…

MALICIOUS

PDF

70.1 KB Created: 2021-09-16 15:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d771307281135668ce4c2dcad9fdae6a SHA-1: c4771c5be3f66b71fa218c9c5e77febf20d63285 SHA-256: 32c06754546436c027bb109406e31f2e132e096cbea0943dfb191c20e2a1f109
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=robot+unicorn+attack+evolution PDF link annotation
    • http://back2wood.de/userfiles/file/72921159201.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/ziwokev.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/nulerasuvaxeded.pdfIn PDF document text
    • https://mauspro.net/upload/files/buzavitupaxofi.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161318d63822b1---94788625613.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/kumividafumubinebux.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130b16be39dd---duvalurativojifiko.pdfIn PDF document text
    • http://safarang.com/basefile/files/3237429637.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/miramixiwobulikul.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/71463103226.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/45215801372.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7f20c178---jovazigumedopafivawuzom.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/40900932498.pdfIn PDF document text
    • https://eniedu.com/data/file/20210904223129.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/h25bcfskl8lvbsl2do2dttpel7/21531702850.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/tuzubususogopomobovix.pdfIn PDF document text
    • https://deepex.hu/hirek/files/84653045426.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161429c230b5b6---rowibunojuviwaxula.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/63361635980.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b9ee204e---nisidozapenas.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613816ab304d3---donigododitoxobunapebez.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/99343458138.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/61881186425.pdfIn PDF document text
    • 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_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 16104 bytes
SHA-256: 24458a8d2eecedcee146cef666ce49a08def483a4e1a14e528454bf9348311d0
font_02_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 10500 bytes
SHA-256: e85e2c386d4aa1dd1d8d331ccdc8aef4ab8e049288ad52e5df1294a07856777a

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