Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc54651af31f9bb…

MALICIOUS

PDF

76.4 KB Created: 2021-09-06 19:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7dc3fc94610c079675e7df2e47cc26a4 SHA-1: e1911e0f6e1fd66ee3d538bd07844fde5f07565c SHA-256: 4cc54651af31f9bb10afe4050c0de0337f70e36153fa4f96f053fd806fc4398d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 sites. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6e670de47---72648713556.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f702812bf8---famev.pdfIn PDF document text
    • http://yongqingtech.com/d/files/magefuxemaxefupufek.pdfIn PDF document text
    • https://mfdesign.hu/files/file/widunixuxekumavokuparavaw.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/uvi8hifp9hjqni9c19qqsdbj0c/7019892819.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb80c36966---60688499176.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087f1b65659e---41168110528.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750d608d210---xuruno.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/q23h97is4d2sd744kjajrjfgk4/71459632149.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/36c4e1d940a2e3214e11854e7e4bed1a/dugixujanomawis.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/61330330369.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ep8nkqbgrgv3caf1vj7v8oom00/sikefagawo.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/bilasojuvaxike.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/rimamabajobapori.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04b6bcb6a9---13100440212.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9e1cc0a51cd0c96f5406279447e33d0d/86026983394.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/53080289958.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/mufesedopujafed.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/allkm5nhg4md63ga5qp5fe2oq4/40287450550.pdfIn PDF document text
    • http://linza-market.ru/upload/files/setus.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e026b5e76---74233186051.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/54537907480.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/bumituf.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/gibomemanapomotukaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=education+consultancy+business+plan+pdfPDF 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_off0000c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 10852 bytes
SHA-256: 24f660286be7d8cece3a4644208a2779d4dcef689b6cdee610e060d935fc3979
font_01_sfnt_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 16128 bytes
SHA-256: 3d78c71a2b553135ca0a644cc8d72875513c4b1fdda93008e3a8ca3d6ecc7997
font_02_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1