Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa740a1fb357c36…

MALICIOUS

PDF

93.1 KB Created: 2021-07-18 15:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c1bf9b9fa854c4fc1cda8ec9792ea9d7 SHA-1: c6d72843c716b98fac7efdf4e55e3c854db285a1 SHA-256: efa740a1fb357c36069eab167dd6405123d53e682257a7de285651845b0bb430
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or using disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://agriturismolataggiasca.eu/userfiles/files/sokugenetivesafuduw.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/gowitosoxajowidigesifu.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/087a2b1d49934ea70af7779cb5be9722/sexoverufeni.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/zinawadanuwakowavo.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/45819161261.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/ictjpkiodbbhq3ima9jrsfrvdj/zizagudeke.pdfIn PDF document text
    • https://strechybenesov.cz/content/14745642330.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609098e95adea---zalitefugejopo.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160865f8f2851a---8639636427.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/toxefewasi.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/tadasi.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ddb3bb7fa9bef240a9a3dd9087685252/23182907818.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/wixikavolijagita.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25917a0cb0---siposiw.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/83ov1mo0nqhvs0a9v1gu39abq7/wodux.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/vomoj.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d900b0f1bb---vuzutelipodon.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/kurit.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6c24d8b1a4dc5612112e1f7d1b9f52ab/nanezezokabesirijof.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/zotefabuz.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088368287f0c---95615527671.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7659fd8260---89424405002.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dc62482d7---33432442711.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b85f047835e5997701f4926fb42aa0c5/89218945514.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/53475360744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wuthering+heights+quotes+about+lovePDF 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_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 10832 bytes
SHA-256: eda44ca069f752b455e8c0f374a4f378e009bb76c054b83222b854786cee3458
font_02_sfnt_off00013b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1E 16972 bytes
SHA-256: ccb2213892b13f60e611016de404a7e0a9a258633e328b66e04fd568d8bc9506