Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efa0ca6445de54b…

MALICIOUS

PDF

93.6 KB Created: 2021-07-05 23:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3ed190a4ef6194479b51b7569893cb60 SHA-1: 50c20b28b1206ff7c078dac9d5c759709adc8780 SHA-256: 0efa0ca6445de54b4014c55af5dacdb0e9699726786cc2be297a9f027d4d6915
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. These links are likely used to host phishing pages or distribute further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ab84d2ed6---rexawogukafukebitoto.pdf In PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05caf269e---gigunifumugifama.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086d185f1af8---26550524626.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098909a223e0---jesubu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160de6c62c155c---sotivigu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609619cd13b66---petavenopezo.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eac2ccdcca---15519984855.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/c2habujcfm2g9qc68h2km5gci2/pajavunizibaxanabeki.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/49b3c1762cc0dea41f1dfe9a9670e8df/96479550716.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/70992a5feafd103456a64280538bc2d5/91284383142.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/97328960735.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/cd9877de8d2dcacce0926b3e037a70e3/3608186054.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/88578760554.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608567b94e3bc---zesosasufetinimar.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/73095a1b934ec114d324089e954a2010/mutebokazegepuduwujoxat.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/natabetopinirajepoku.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88060e8c22---72933501337.pdfIn PDF document text
    • http://aquinasnb68.com/clients/9/9b/9b9a52ed12f3b440fa02b6ce64642487/File/48686478882.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/26462145896.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210622013803_1503362797.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/lemojep.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e66521cb278655fdae626145486d9a5a/gesiwibozikakeparux.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab637a6d9d8---gitivupopegoregunu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083947b80cb4---37576155178.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e06e6d2dab7---rupufevutaga.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210503123031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+brisknessPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e799.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE799 18164 bytes
SHA-256: 86b22df796a370009884a4e85ae006c42e8a82accff8d9cef10020795f0f3767
font_01_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 21192 bytes
SHA-256: f07707f6cbe4933a8988b9619e19f50635881d2e6d88aee3fa12d695981f8205
font_02_sfnt_off00013895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13895 10472 bytes
SHA-256: c332eb4ad74af56a81afa3b44e8c3e464534f9aeb55de4621c259e305630b6cb
font_03_sfnt_off0001507c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1