Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd55397332515f9…

MALICIOUS

PDF

103.7 KB Created: 2021-07-30 17:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0bcf9a441880469d2effc4ac5cad9b0 SHA-1: bb2042fe8ddf5395a4bf89c666394d5134c3897a SHA-256: dcd55397332515f9471e9fe1f3532c1cda447fb9167a6cd15a4a560939670750
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b81d6dcd0e---21308074504.pdf In PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58908140660.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/874012da8609c4b233e54d39bc58c7fc/63426092368.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/2071384413.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/xosegizuxagojuwafuzizeno.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/h9u1j49nv6h3s13bmcqutrkrr0/vitagigo.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27fc4203cf---janixapilimosip.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5v8c622pu4jerutals9ju6qj0m/51547194924.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/surodefunuwunareviso.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e77a24179e6cb65280701cb5d9668db/49185437218.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b7d87661e78ac20398be621c345d30e6/temuxefidaxulufafevot.pdfIn PDF document text
    • http://01host.ru/userfiles/files/puposofezin.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4a7c375fb7fb0b48fc62cdcc4618bf71/37148953316.pdfIn PDF document text
    • http://mobilenmr.com/files/files/kojajesizakixikowuvire.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ee4b4e064---2468454099.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/zuxuxojenexikebeputot.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a841984676b---50508012592.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/namadijasisufoleziteli.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/pokosasegid.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/zujolego.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/94480246149.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/3057988652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=transformers+revenge+of+the+fallen+gameplay+decepticonPDF 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_off000129be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 11208 bytes
SHA-256: 86d59ba0f6fa8fbe32c85444f62746f347c398a5b933aba8382fcc8a208834a6
font_01_sfnt_off000143a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A3 20620 bytes
SHA-256: d92b7b9f226bc62c69de14d2bce62b7bf730c4c8680c5a8f284da7fe872d8038
font_02_sfnt_off000177ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.