Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1070c1052609cdb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 03:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 374c7ee877a89db1642566a3e91edf54 SHA-1: 8731cdc3a8fe157055751e1525841dc1474850c6 SHA-256: c1070c1052609cdb4aefa0c278ea8a77c179635f181a21601fa3e38c5a579bf0
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including one pointing to a WordPress upload directory, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lahma.pl/_u/userfiles/file/43243111990.pdf In PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/44121604728.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/47185133055.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/vukusazowenuvotavisa.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/xenibomesulu.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/98904307405.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/54061154096.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/73305559894.pdfIn PDF document text
    • http://langyupharm.com/upload/files/56303336358.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/xaxumudegofidufoti.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3cbde8e2---mewuvujazizutebezu.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jaxute.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/rowejutuxok.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd400efc7---11131404945.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/v1b12scd7o0agp6ou8uteopsal/sulexepokirefebetut.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/pejidibapizoki.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/tolupijizawitamaga.pdfIn PDF document text
    • http://poorclarescork.ie/images/xabaxorupip.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/dejomulepa.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/86189584558.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/semugelarexa.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dcu6o92oe1iuv4ua8qsenv2qah/30188469993.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/63209232765.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/wotirifix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+android+phone+price+in+bangladeshPDF 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_off0000cf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF65 10988 bytes
SHA-256: 4804ef3450efa1e1fae933a567358ae39a2a7c8add9abdddb952167e403f2d09
font_01_sfnt_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 19692 bytes
SHA-256: aec27706247a7aeae8f9633f3d3bc5b6c5fb720ddaca2950050b9838ccbbf3df

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