Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddca3da3c5fa88fd…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 02:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6fc33203f1c10c5f8d5aeb684920e2c SHA-1: 588dbd6d4dbed9bbc49041930d2e580a3e0634f4 SHA-256: ddca3da3c5fa88fdee4394716ea7209133d8fe6aabeb6400f2320c186201f869
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://alanurturizm.com/rsm/files/20056447088.pdf In PDF document text
    • http://zae.me/datafiles/file/38378995342.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/55642589173.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/zuvegefalefakexemexunixu.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/38189612553.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d5ecce401---11596351860.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/povekasifudobojutila.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0bc4f0e5d4fb035e00fe06908caa15cf/14783357249.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/pmpf1d510teg303kqjio4999kr/57583647188.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/60782600872.pdfIn PDF document text
    • https://mihalex.by/files/files/14247836325.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/4037809107.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/nefas.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/lemorodalumenikugibu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a13a70380---fegadavogukibetuvegudibog.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/bi34iockovinu1i8t42f416ps2/xogatewirafufunikalefepob.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/85ahpjink8h13ub28p00mm6gs8/gevuzadepeme.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/43462019450.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/58480783993.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe88ddecaf---92961479956.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1f19b9f7---69334183479.pdfIn PDF document text
    • https://saam.vn/images/content/file/17068482244.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/mipijoka.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720cd4e1604---tefeparepokuvupoma.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4pa28ti5m0frhmen55jcrcs0ce/xiviwodupajawiwefox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+fastest+growing+army+in+the+worldPDF 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_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 10992 bytes
SHA-256: b89772e4e2cba286628e1ee0d86bf463c94b72e8fd3303a3e025ed57c7014210
font_02_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 17936 bytes
SHA-256: 633edec9a8dea3dfb884ed2bdb84397bcdc3cf742b454f41f49237ac4b19fd77

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