Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bff2ceeea8c18c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 16:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 395db50cee934e898cb06716022bba04 SHA-1: 24ff80dd80770b6e47e95a8697a2f7f62af3e1e2 SHA-256: 58bff2ceeea8c18c510291350804e06cf26bb659e91932bf9088945536282d09
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 0.9961

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://pixomot.ru/uplcv?utm_term=arta+conversatiei+ileana+vulpescu+pdf+free+download PDF link annotation
    • http://esteel.my/userfiles/file/tuzinadidekowelelewe.pdfIn PDF document text
    • https://anfauglir.com/images/file/45972408434.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c0ee7cc9---80177665804.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b7167b07---supagan.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/luwarisonagom.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8cbfef3b3537c049ef0ea1429c48f42c/nuwukavozajuxelarufizufu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f64788425eb6e98b0c415ecf604ca581/sexepopij.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949b96fb70---30733766641.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/b805bh6qnj5vstgunip5ptadfm/21663307628.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/momosevugemilojug.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/2a0fe443607d6641dc23978a050c7b5e/12175136351.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/puxumatobab.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/e15d51f5b0f85dd7ac2484a66e902f94/94107015244.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/6646351331.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/58055942878.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b6c418db175b2d8afb960dc5692ecbd7/zewafiderazelezutojeva.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/83783688059.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/gixosig.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/goseresoxejipomez.pdfIn PDF document text
    • http://renovator.cz/files/file/wenovux.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/11729355054.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54818d664---sobajovunazuxafikajox.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/50567335210.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 19384 bytes
SHA-256: 21f8a9ea4bf13b6b5f34608db605affd528fcc2f662f16dbe5d82909df3f80c4
font_01_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 10844 bytes
SHA-256: a13e9d591b2f41327b55ac64dd12e63b7e843a0c18e422f9428ef2069758ef2b
font_03_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 1972 bytes
SHA-256: abce750aa9dd6f8b53469ac7c617e9099c93909a6b13092acd96821047e63c6d

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