Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bac9343ab73516…

MALICIOUS

PDF

76.6 KB Created: 2021-07-31 02:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9c590fdca36c52c76ff59fc193eb1cd SHA-1: 4ed8e2b032abb8c5971cb37720cf2b2696481fd8 SHA-256: b6bac9343ab735168626515ae7c13ac8b3068d9c679d993de7bda749839e9598
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content or exploits. The presence of multiple link farm heuristics suggests the document's primary purpose is to redirect users to external sites, potentially for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://aow.infogestnet.it/ckfinder/userfiles/files/gofobubikiginozigegejab.pdf In PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/8340819158.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070657a39228---fewutugosewubop.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/8367505912.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zufiserobusevudonazuduv.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/62122125969.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/20645243422.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a00ee497b4f---mikosenex.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/fs33ei7p2u8se1mmes4i5da1b7/besikovel.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1620476741344.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160739119b6a5f---60745435529.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/71385331488.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/pomezagose.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83cb9e95b---16848917085.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/98f6470f916c1d412a5fc28d2580900e/fezedatevinibodamiz.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16260995471839942587.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/fexopibofovudetegamupom.pdfIn PDF document text
    • https://citronel.com/userfiles/files/sosovilazufuzera.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/ruwasufoguforif.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed90d9ec121---kodobipekizerumo.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/nubigepanegurula.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/v832ihakf3gj3coorpn8o9pfl4/fijodokagukofez.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1mb35iertfq1fhbofh416rco67/toripiwa.pdfIn PDF document text
    • http://goref.ru/files/file/23282333339.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/zefixolirike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=symmetry+worksheets+draw+the+other+halfPDF link annotation
    • https://www.alamy.com/licenses-and-pricing/?v=1In PDF document text
    • https://www.alamy.com/stock-image-draw-the-In PDF document text
    • 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_off0000c87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 10788 bytes
SHA-256: 6ca250437377d292acb1cfcb53ab48f60a2479aac832ba74e6fe32e951b696f1
font_02_sfnt_off0000f985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 16112 bytes
SHA-256: 32df7bb3c7ffe4ee03edeb1de2d2c36c8eb31756177ab4f0fe071d1d4d062dc8

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