Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a84a7a765b34cf…

MALICIOUS

PDF

104.8 KB Created: 2021-08-03 18:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2279f9fbf9db66a786284998e4229912 SHA-1: 268e0538b0971730da00efe91caf8b041a39553d SHA-256: 02a84a7a765b34cf175c46ebae9cff50dfd787377ba61a5e1a5b05ee00db96b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6697c939bb---xufupenijena.pdf In PDF document text
    • https://dusunceokulu.net/resimler/files/22306425148.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/ropipixisefafepuramofutal.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/zonuxetaxoxe.pdfIn PDF document text
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/20570470683.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/93561780040.pdfIn PDF document text
    • https://businesslife.com/content/file/70579700317.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609546bbb0efa---roxog.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/23897010114.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/fedavufadaloxotibogad.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/rofikotavovopuxexutero.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/09p0c4viriq4q02n81jv5pjgd4/pudilesokurad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58246b0f53---xalinuzas.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/82553996537.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/63931522277.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1fefcea3d---62836524177.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/5f93a94ee0790b9ed154c2c195eaa0e5/xoxuduv.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/32582681178.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/83928734653.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f7b7093d---18777205022.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d9e9e2a0226f33de6b5343e3c0e6e3c5/6098355678.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/424ce948d31c988cb9a279d101482160/xitupanirux.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7fef0568a---suwavuwol.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/3h272ullqtvhm5msqjn9332sn7/fenunetijudesufufekakaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+strongest+interparticle+force+in+so2PDF 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_off00013497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13497 17864 bytes
SHA-256: 0b7cc06373dc70fe6d6b8d2e1d7d50a637f6a1ad940f7d629d64eaa155c1e451
font_01_sfnt_off000162e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E1 10872 bytes
SHA-256: 2f2bb3d503a14a125a213e3a6e271b7c9ccff4106d82ee52d1c55fa3f054511b
font_02_sfnt_off00017c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1