Malicious PDF — malware analysis report

Static analysis result for SHA-256 765022c543170f11…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 22:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1caa37c96da96180497e9286ef0bcb5e SHA-1: 48fe1e1bd3375eb258893a88a261a6c9060b7235 SHA-256: 765022c543170f11792da6e3299df3b359c06bfce1d6c0abdad209b189f59124
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating a link farm hosted on potentially compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware via these links. The presence of a 'plants vs zombie 2 hack apk' URL suggests a lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sagarexpress.com/userfiles/file/16023984483.pdf In PDF document text
    • http://language-coach.pl/uploads/files/posilafuraxeravobemivek.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130d6d034a88---7448435934.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/wufidekalezeruzogul.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b259ad9bf016c520d514b1586390ed49/86053172812.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/vebajano.pdfIn PDF document text
    • http://ccshecea.org/upload/files/29373844407.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/xedomafeviporobapugononim.pdfIn PDF document text
    • http://gnox.vn/upload/files/gexuwomupuw.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/72286354374.pdfIn PDF document text
    • http://cartopack.com/Images/file/ruvinamalikor.pdfIn PDF document text
    • https://emenu.hu/editor_up/78462505722.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/27612460448.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/fologerabavine.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/39407043177.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/30363722276.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/merosifo.pdfIn PDF document text
    • https://slotpt2.com/contents/files/telavadiwozeg.pdfIn PDF document text
    • https://kiptep.ru/file/96435846978.pdfIn PDF document text
    • http://artio.pl/files/files/21730006858.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7d23507c957ee00d5de7883db79a5477/ketasulupirujuzavawabuzi.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/68540987683.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/gozeno.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/89209397757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=plants+vs+zombie+2+hack+apkPDF 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_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 17124 bytes
SHA-256: fece15545c59297323abcf679c8b12376fe3f6878ba66477d213d7c089743598
font_01_sfnt_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 11020 bytes
SHA-256: 7d45ea19d8c52a1533dee501e1423cbdabdc704f584dbdf8816b3d5307cd1680
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1