Malicious PDF — malware analysis report

Static analysis result for SHA-256 f307300c23191d02…

MALICIOUS

PDF

89.8 KB Created: 2021-09-15 10:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08b4665eaae95171d59497574895e3b8 SHA-1: 52e76e0b7ba01d2afda1b13707237df466d8bc75 SHA-256: f307300c23191d026b1b143462d3417737c39ba7686d0add06ac9a6697515582
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, despite some being marked benign, contribute to the overall malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0278af85---33842193412.pdf
    • http://meskerjager.nl/media/files/11030743106.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/kudizigu.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2710e4c37---54280138198.pdf
    • http://omeofest.eu/userfiles/files/66417360680.pdf
    • http://www.polni.si/Images/files/tukaxixajijexijazamavarif.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe3f6c2cf1---48021706513.pdf
    • http://joesservicecenternj.com/userfiles/files/51282161281.pdf
    • https://rawoctane.com/uploads/file/basubapixoruf.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112334af52---kotatufusegiponurem.pdf
    • http://canadianrockies.ca/files/file/tijaseja.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd2c57c00---82780314698.pdf
    • http://intertravel.hu/_user/file/bezevebe.pdf
    • http://grandp.ru/userfiles/file/191598540.pdf
    • https://insinkerator.us/images/uploaded/file/mujuxupojapozoxelajo.pdf
    • http://henzefashion.com/userfiles/file/12050079687.pdf
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/sasuxeborexitimaj.pdf
    • http://gpsputhuppally.com/userfiles/file/71120252837.pdf
    • http://sicompk.com/survey/userfiles/files/junizonodupuv.pdf
    • http://vendsol.com/userfiles/file/wumunadanuw.pdf
    • http://kawana.tech/userfiles/file/83471525595.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b088cfce113bfe1afa428307b68d30d8/vuwemaferewomef.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12584724481.pdf
    • https://himarco.ir/basefile/himarcoir/files/zeninorufizabigasajebet.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=horror+movies+free+watch+full+movies
    • 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_off0000fa83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 16792 bytes
font_01_sfnt_off0001129a.bin
558628a1b6c3069596259456d91c78926dcae2b6d6eb64be35cf9c81212c40b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 10740 bytes
font_02_sfnt_off00012b58.bin
0cf571e8e227bdfb44c4ef1b5a75eef31c636be0962c346f2cf445d1a1b423cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B58 17732 bytes