Malicious PDF — malware analysis report

Static analysis result for SHA-256 784a1f8240cbd353…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 23:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1623085b951d8c93c52426a924c00065 SHA-1: 0d30a48343de721e5edfa61d3e9de90fb6eb92f2 SHA-256: 784a1f8240cbd35370203be3b53a37d6887993ec01b31f2bacd4d32c12927261
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/1606dd7b70828c---69665123393.pdf In PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/q8ldmmkf1jc5ovm16mqdablnj5/50980608449.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/malifosejatokowi.pdfIn PDF document text
    • https://susta.vn/userfiles/file/kuregirotumefax.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/kataj.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927b6be0814---80973718609.pdfIn PDF document text
    • https://jambukuning.com/contents//files/botodu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7r6g00c36ulv7htv1enlp4vlhm/88855204523.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/41802214910.pdfIn PDF document text
    • http://landbondcorten.com/attachment/file/18b305b544b054f2f4cf34031d7f0d69.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/59495869863.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fef07402---25675717230.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098faeaca88e---15725861960.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5416d2e9---bumiroforojisotexa.pdfIn PDF document text
    • http://matras-devison.com/upload/file/48113473187.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b7c18d61---vagulovetujebegur.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/37405234216.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/nebife.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/28d3eb9712b5d3387761ad653d91be30/kezusiralozusomugada.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/kiwexapiruxepebamiseno.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/31953231352.pdfIn PDF document text
    • http://accronline.com/userfiles/file/98313402316.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c98db5e38fd---68695052028.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982551d256d---xikenoguzupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=moog+theremini+manual+deutschPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/49741593743.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_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 10912 bytes
SHA-256: 38f4e76464f3c318dd76c2d796e0d2162f3e39972479e6a3a360a288c6c6c920
font_01_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 17876 bytes
SHA-256: fe62c9856ac62a4d4fba03be1ad33775cd9acbc6ea2a5fd8472ae79009bb5c27
font_02_sfnt_off00013802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1