Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a61598c672b5da…

MALICIOUS

PDF

105.9 KB Created: 2021-09-06 04:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e3e9beea6747a6a163b13b6eae6dce3 SHA-1: 6b9bbd074373ffa37d0b676f6e84bad6b6b8d8ae SHA-256: 75a61598c672b5da84ae66fd47b4d6b6995c005be660d5586d8468924edca38c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the primary attack pattern involves luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://inwebjor.ru/uplcv?utm_term=communication+skills+barriers+pdf PDF link annotation
    • http://ros.by/ckfinder/userfiles/files/wetowejatif.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/nagejiduzoranojikixutigun.pdfIn PDF document text
    • http://askort.pl/Upload/file/91708713589.pdfIn PDF document text
    • http://lg-palette.com/upload/files/pedosebubufokutewo.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e231af26ebf7ce3a15bcdc2202c56180/susogutagebusawamezep.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3ecb0342---bezupedifuvoruvizefate.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9ab32662fa34ab4a16e8d3cf49a7318a/37676962518.pdfIn PDF document text
    • http://deltools.com/userfiles/file/xeritem.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611581e5b2e76---soduwulaw.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e189d5c4b3---dotujanotiziz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ce30174ed---70082642009.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/37017088953.pdfIn PDF document text
    • https://renault-service.com/userfiles/56863788733.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/womisiki.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/99954074579.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/20889338547.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb67271912---86977848835.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/gekoworiluwolevusojeror.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/kuvigegejigizuj.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/3h3fqp6ee9hu88eta9qt0mjlrc/83153982192.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6be618d350---bimafepekivojux.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/4360261999.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gaxodabowe.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bbf2ba0bc---mafunasijiwokifapatojolef.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a3f6bf7f7---65892678927.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/18753282066.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_off0001377d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F94 11144 bytes
SHA-256: df14e9c838a2532820a919f5e93747e3457cd353698e36f658d5468f896b2501
font_02_sfnt_off00016963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16963 18692 bytes
SHA-256: a27d24aafb4d51e8303c09b55403dbd1e6ed2b36885316e571e138192dc087be

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