Malicious PDF — malware analysis report

Static analysis result for SHA-256 df841462e98ce06a…

MALICIOUS

PDF

95.8 KB Created: 2021-07-05 18:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a70f400772747e4d83ab6069e2a130ae SHA-1: 0497b32aa10978c817c373326d2743e7eb5f44b3 SHA-256: df841462e98ce06aeea76b413d2304cfa8b03232f250b19f8673c30af52fb0c8
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it's a link farm pointing to compromised WordPress sites, and specifically identified as an advance-fee scam lure. The embedded JavaScript likely facilitates the redirection to these malicious links, aiming to trick the user into a fraudulent scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160853f08591e8---28567593305.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ba68b30fa58---96642227879.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5630152703b3a40609e45d2c1ff7bff6/53728806923.pdfIn PDF document text
    • http://charivne.info/images/file/vonogekatugulenawon.pdfIn PDF document text
    • http://allasclub.com/campannas/file/wagosetuko.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/aebsabaoa4l47l59u00clq0tfs/narusakijekareje.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a5f518c362ad374561e8c2da524906ef/29084829269.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/tcet4f307th87ggtd5e185sud7/fegenipimasipur.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210705014638.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b331771566---sezopexizupuzeruremirisu.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/piraxezika.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/vubapojolozedu.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/sewawikegifukuramopi.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/lapilajemexotefoxulosa.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac860a852c6---92374624991.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/73840705852.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/mevetaleporoli.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/2lcqjldhtacgovhqr26703iuo5/nexekadelerekeme.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/zubamugigesawipozanis.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/7739306559.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082ffe6b8097---fotinevudez.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/tunekanitiporuzofus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=top+20+fully+franked+dividends+on+asx+2020PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/00c8438c0bc090ad5819ea3fb10afa4e/degiliratimogese.pdfIn 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_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 11072 bytes
SHA-256: ce0b533a7a8e16d103de24c4c2ae95bb6bf746c3c4842ee1be2121196963552b
font_01_sfnt_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 18068 bytes
SHA-256: 78c74dea0a52441a4379ac4d2fd96e6bf183c0839c19406bd842f0b291da6df5
font_02_sfnt_off0001598c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1598C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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