Malicious PDF — malware analysis report

Static analysis result for SHA-256 75580436900952b7…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 20:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bfdafa741a74f50e810f2d6345fe626f SHA-1: 4a6f76de02218728605d59ceb19f314a3fcb028c SHA-256: 75580436900952b70adbd214ed02d065775fdeef0e28efe1e134f34ee22e97aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=south+gate+police+department PDF link annotation
    • http://edu-tur.ru/userfiles/file/vorumunomefanujufu.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/rakokizelekipefofuwatip.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/vomumaxisapotanafodewajot.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609403dff1d85---77819956970.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/26137373083.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/dupegixegozube.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16111f2b4f094b---kenexisesetat.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd66a8eaff---60449658630.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/81360276247.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4cccbebc8c7b9a27728aa53baba0d928/91885824498.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210703142844.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3a53886da6dcde0ef291c3ec6d19c415/16511894870.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/070bf1fd2a811e4e27a8cd3a34e94010/64293560420.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083171b0e544---82460969331.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fbdb7d279---fajarenogomenoxewiber.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/39938412328.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f29e9e99---96297397178.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/02da41b9e3228962393771e2b5330d3c/logipiwefojolusuwoxab.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/10439075294.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b25d917bfaa---lujaj.pdfIn PDF document text
    • https://preciseenergygroup.com/media/62695925033.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/72699cf04dafafd664a0dc8ea666d585/zuzetutemabuwoxi.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a6d387f009d282aea2eafaa8763b342f/83006605897.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e788a0e7ac42a04b9e64b8bd10931cf0/zazer.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/medusakobod.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_off0000c01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01D 10968 bytes
SHA-256: 8d733977e7199cdc7f8e9041cdb9068acb50db45d31ab715d5fcce2a66ab134a
font_01_sfnt_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 16056 bytes
SHA-256: 59a2177a1bb705452194ae93e30bc2450718fc62389c83f374967423d6307c93
font_02_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1