Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c844a9a9ce70fc…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 08:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0aa028a5e8276cfe0993b47a156b438f SHA-1: ab1b8863a9cbd0e3ec769dc02cdc68fa69b757fe SHA-256: 59c844a9a9ce70fcb4caedf0063ab8f4fe820999dd3558f82bf914a2efa79974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting sites, many of which are disguised as file uploads within compromised WordPress sites. The presence of 'utm_term=nuance pdf converter technical support phone number' in one URL suggests a phishing lure related to technical support for PDF software. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness, supporting a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://bftt.marketsearching.com/upload/files/goronad.pdf In PDF document text
    • http://ydyb.com/filespath/files/20210819035803.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c977aea2c0727e8944459bed219bef99/ximimugudaf.pdfIn PDF document text
    • https://digireg.dk/upload/31847133372.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160736b2b400dd---xaxamogotugasopoginejaw.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44d37c3d2f---15958526443.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee5c32eb28---kozefegesovikev.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/90000248197.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc2ae1d92---mujelimudanudoxif.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/76768684347.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/63549348276.pdfIn PDF document text
    • http://stylekd.ru/files/79611429096.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/riduluti.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202105260408400341.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/razawepoxogolum.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/wexirep.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/32432521985.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a2060a7ff7b7a19c84fe791a12bdb0c4/62706105133.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/lujotemoxelakogikeri.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/bukulinebijujego.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd76ab6d9c7---nojoforebujaxalafideja.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210709/file/1625838187.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/295ef189aec44fec18eab894f442f25c/gotamilod.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/mawojuzegedokokosidasomud.pdfIn PDF document text
    • http://charivne.info/images/file/nepuwidew.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a0cad1bf668d678985d7d26852efd03/daxezuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=nuance+pdf+converter+technical+support+phone+numberPDF 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_off0000c3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E7 16644 bytes
SHA-256: 24bb638847400bf224662dfa8ef106ad5c803b3e37c5b4da1f4ff9fd871a46de
font_01_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 11168 bytes
SHA-256: a73621d6d7f42ce0adb9224795d774aa858bae60854e8c57d98e41fe7d5e3c62
font_02_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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