Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb79745402889620…

MALICIOUS

PDF

90.3 KB Created: 2021-07-06 19:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07d4da7ca683b222df142027eaf4bc5a SHA-1: b3800c196ecbf9c417cf52dadc97833d9b3b2c02 SHA-256: fb797454028896200e0696baf5dbb728c7447701d825a38b383dc3f38e508afb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=thermodynamics+an+engineering+approach+8th+edition+solutions PDF link annotation
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/gn43ofjpkvk8qepu5dmr35v4l2/fisijimidako.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/komisib.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/70719396019.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/5jdqio6g9uhefm1f6mrqp81bd4/46072526951.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a14bfb9461c2c3cf1ad1869a52fd190e/rijelesowomanuremejerasek.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5763811cf---34524894637.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/6129187713.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c08a65e40ee9e3412fee8e04d523fc25/subutamajuviwazafegesuna.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc196d6788---66973272798.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff39c8e0f---zefaxakif.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a4950ca2edb---36232392571.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/dofomokukuzezi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756ee4b0f4f---kifesuseferaxakitavifazep.pdfIn PDF document text
    • http://nature-revive.org/files/file/lisefoxizifugaru.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/22367378622.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1299f3c132d52eabd0e3ca9ced0ed73b/59091960518.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab86db175c---62413176836.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/57355865192.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608f31d78a705---nunezikuvufowogo.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/zusonupavuzaw.pdfIn PDF document text
    • http://bamila.vn/luutru/files/rujezeridenuberewevifeg.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784b83254b0---vetowopokexitelexa.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d91f998b939---tijobibese.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/pudezofetonebavu.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/tobutiniwisidunewerebixax.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/53174308477.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_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 11344 bytes
SHA-256: 27bbd819e6eae1285802acfd28e4feb91c016e8313ca63657dbf9a5fd80febe0
font_01_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 18248 bytes
SHA-256: c53af73a294f5a8275d63ccf00a766d5f8378ad9c65dee0e4dda9df9df98acd1
font_02_sfnt_off000142c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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