Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b0915ffd3118a9…

MALICIOUS

PDF

68.1 KB Created: 2021-09-20 03:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eaaedafde73821fa375068179f38ed1a SHA-1: 6046de5a7b5ae395474115773c3a3c6db29c6646 SHA-256: a2b0915ffd3118a9b010dba7f74962c10605f30786e061d949f60ee0abc0a263
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'PDF_IMAGE_LURE' heuristic suggests it presents a screenshot to trick users into clicking embedded links. The presence of embedded JavaScript and multiple external URIs, including one pointing to a compromised WordPress upload directory, further supports its role as a downloader or phishing lure. The primary attack vector appears to be spearphishing attachment, with the embedded JavaScript likely facilitating the download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://garglob.ru/uplcv?utm_term=trackmania+download+android PDF link annotation
    • http://whitedwarf.ru/public/images/ckfinder/files/ziradifufirapexa.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/mujakewota.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/gufisutikimej.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161350e362072a---dujidewenebadurugoj.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16147a71a78fbd---matizosawenikoza.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vgo4cr54are7cqajdh1g3m7erl/12538431668.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/90074186358.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e25075c6---xujexaborakirakenafomew.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/firini.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/vuxaje.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/zomaminar.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lobunebafanituvuwodiv.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/lexevu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/mirimagefeporenape.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/bepaguxidiwelosevaz.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/pejowomuki.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/31356836186.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147661c574b1---46567698876.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/ridofufefisewolukop.pdfIn PDF document text
    • http://flexa.cz/docs/file/24857336053.pdfIn PDF document text
    • https://hse.tw/upload/file/sogilaxoxojifejuvoxurores.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/fexil.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_off0000b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 14204 bytes
SHA-256: b1ed6ad3463303717b46524caadb9160dd470828d6676d34b455c25804bf1063
font_01_sfnt_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 10276 bytes
SHA-256: f2f86066cb3a8d0b0c28af7c2d9f0c72e30f96243f52632813c2e13417b57758
font_02_sfnt_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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