Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4186655a6ef3e2…

MALICIOUS

PDF

84.3 KB Created: 2021-07-13 19:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c84dffe1b1e4a302ce37cba0b29c956 SHA-1: d36df28cffeb0be644595ad2283cef76d7b9373a SHA-256: 1f4186655a6ef3e2e7bc97f1d792606b73a89f10dabe9de72cb60997dfc90931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and embedded content, though heavily obfuscated, are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+create+a+calendar+invite+in+outlook
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/9671529508.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/nv32kgdf3i3skbpeoiqc40guej/36166443080.pdf
    • http://sotel-perm.ru/site/file/fenofizapowezupitirerabus.pdf
    • http://coopmong.com/ckupload/files/kekijetulujamigob.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705ecc855e4---dizadudaxamukasik.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c4b96c094---31827321062.pdf
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/niluxiwanotupetazit.pdf
    • https://dm288.com/slicice/file/dedejokesijodil.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba41cf86fff---59128217371.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/270729866454ac55c1465db087acc1f2/wupixidisepamimebev.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/962527e98ad4f9fc5b9d10273276becb/82745147938.pdf
    • http://boursemoi.com/userfiles/file/kovavixawuvogixobuzofojiz.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d917a52156---41523815659.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/fidowutokasixokipotixubo.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4vdajde0jggdugrjp868609n81/5308715251.pdf
    • http://americasbestwingsbeltsville.com/uploads/files/70144054229.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6f2a9a42e---75079851128.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a901fd76---lunas.pdf
    • http://halongbaycruises.org/upload/files/gudenis.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/44aee9e32d056f333eef98dab3f3a51e/najunawuretobizajebi.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ht9ugedqm5kkv7dhl9t2mea35u/42700296306.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073441815cb5---243349015.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1658a281b64f46df97be7ef28c13e7ca/93946044971.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607517f6da9a9---tugirali.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b209e4eb2e---29605751519.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e796.bin
60d22c1615555cf92e680d36a578540a47a53d4830079477527dc1ab816d025a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 10528 bytes
font_01_sfnt_off0000ffa8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 16792 bytes
font_02_sfnt_off000117ba.bin
be7b113cfba3d02ec6670fefa16f49a186eb0cb0b557fcb9a9d1674f74825960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 16848 bytes

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