Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08d69d09e0e37d3…

MALICIOUS

PDF

90.8 KB Created: 2021-08-01 16:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 134e03ba341e9efc96da679712c14c86 SHA-1: df192f65db518b08f916107bcd8d00eab8da2cfb SHA-256: a08d69d09e0e37d39d23ec4268714d9b9c5bdeab659c91546b953b8d96ec5eca
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://mimpishio1bet.net/contents//files/kumidazozurupaxub.pdf In PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/vegumap.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd355a2c9---suvekosibuzemo.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/vexepa.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c0c78d3116d70e0d29ac6611e9b410d2/14646803906.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/83122894162.pdfIn PDF document text
    • http://3will.org/soubory/files/mazoliponefebokagazewev.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0285f467---396587990.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/xupejobajutomitaw.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3e830c45b---sokafamereg.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/9805600060.pdfIn PDF document text
    • https://dm288.com/slicice/file/18544519925.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a25b18f11192e41eda9758f348f33343/69452354858.pdfIn PDF document text
    • http://remobudostol.pl/pliki/60527219761.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/99210310116.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/genosasajerexo.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/25419801996.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/r1ur04qiigcgdm0mes0gktl3q2/befaridizepiwuvazapikud.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/84144e99dcd3ba604bb9ed27c950f642/88775077268.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/77391956364.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c9d1cbe6ae0324c85662902ee096a63f/18356204522.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/kaxupidinawefiwawiluxomag.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a524e71c92e---54995298111.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/6122667957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+much+is+dale+earnhardt+junior+worthPDF 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_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 17484 bytes
SHA-256: 22779d81aa00a7ed6a4d44950c6067876d99bc2837391504f86c6066ab389784
font_01_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14256 10940 bytes
SHA-256: 7905e44472f2b25a9cbd953a695fbdb361168f1056996571254394906be160cc