Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c00fa0c098506f…

MALICIOUS

PDF

95.9 KB Created: 2021-06-26 21:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2904344ca869434841bc0068c97a5193 SHA-1: 00c9d783cde472d3e276d521036ae3f77da85b00 SHA-256: 58c00fa0c098506fc226b40128e45f09d31dc5b7fec8c0b08ab140e108eb3afb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content or downloads. The presence of external URIs and link farms suggests an attempt to direct users to potentially harmful external resources.

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://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/vi387hsqimsmis96j2hju6k9se/miritalemiki.pdf In PDF document text
    • http://mini-garden.ru/userfiles/file/41615020156.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/d169c84e850f47f97c8b21aa593676d8/96558939635.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a725263d22---91730381886.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd98acaedc---30726824549.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/xugidavoti.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/92218235388.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9753033a5b---nogetofasen.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609231e0e64b7---75505654357.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/nokegejizejetem.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a14bfb9461c2c3cf1ad1869a52fd190e/rijelesowomanuremejerasek.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/tiun8s9rbrbbupmc3brjpg7ipm/bawudijajedakupigo.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6ce78a11e30eb8d61365721a0cc1ec6d/dadani.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2e4b38d18b1858af440b693e2741c1f4/jiwubewugimubur.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/35986763991.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210626_C6981215BD0F4BFB.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1ec41382---57319846341.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e70443c1---71140033861.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84deda628---folidivisama.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/64156649216.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/5c69edc96607fb1470a14c2e9f717129/80253546768.pdfIn PDF document text
    • https://85097781.com/upload/files/33451457836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+the+pdf+size+smallerPDF 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_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 18508 bytes
SHA-256: dd3bf067d14a741d2f03b21ecdb231e60dc0cc3d39a7abe6b7212c89f9e68d7a
font_02_sfnt_off0001594b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594B 10888 bytes
SHA-256: 53213ecea9efdaecb2a6cb174ccc28ff790fe33e081617a812b76e1b3094680c

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