Malicious PDF — malware analysis report

Static analysis result for SHA-256 33acbf6f9c340121…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 13:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46328af29b8cc735376c2af68b5dae00 SHA-1: 42361329098f1a61780b88f58f2b67c72afcf13d SHA-256: 33acbf6f9c3401219810c471c451af2541a2cb312d7afdcdccd840374c85e211
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristics indicate a focus on directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3b1eec2a3---fekewavo.pdf In PDF document text
    • http://mastervgtour.by/var/upload/file/51487161617.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210910032054.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/pewuravov.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2gq6orjib6ekq5rf4k3iujfbg7/38572599565.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/taxofapisasedobamopo.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/naxazadezijizorekusuvo.pdfIn PDF document text
    • http://mobilenmr.com/files/files/1059944907.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/zavunoxu.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/polikabe.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/be672e3d010151281178f84df4c287af/folofimominabaxajupi.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/20566245454.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/josozewomululitarujafup.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/75312903865.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/31316487508.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/pijigusumonelarupidesa.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/magotidi.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/pawuzonetusosonakalaro.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/32324502691.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210903100646.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/mawigufudugiworelabepoj.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109221911334828.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/vakabijuxerolexof.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142afa497a20---visaze.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/1725569020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+text+on+my+android+phonePDF 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_off0000b13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 10736 bytes
SHA-256: 4625e3e1615aa22adf1a7089c9f4f9a7f25f5642e91a376fd3f0c688328cb962
font_02_sfnt_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 14384 bytes
SHA-256: fef74a6cdf2405cf8f76ac82e15f8892a275c439ffde3b04742721deca7c67e9