Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b0ab2ef8c6a391…

MALICIOUS

PDF

90.3 KB Created: 2021-09-15 14:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff8b750da9bcf9a203651d88c44aa83b SHA-1: b3a325c2ed5322221da840dcf5ff7560d170e06d SHA-256: a6b0ab2ef8c6a3918f556765a953f773a248995eeb9ae2802ff2b51890eeb693
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://candientushinko.com/images/file/56957640274.pdf In PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/8917729083.pdfIn PDF document text
    • http://iccarrentals.com/files/file/zenerogitudunumu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da45bb578d---15017737183.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://wamer.org/userfiles/file/kebozi.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/zuwesilixuvode.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/81134718831.pdfIn PDF document text
    • http://strandedtattoo.info/file/5479827124.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614046219d356---98371445080.pdfIn PDF document text
    • http://01host.ru/userfiles/files/36027591029.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/buxividawizoxidiletegep.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2419a893a864a956c5c35e74eaf62518/41462283830.pdfIn PDF document text
    • http://scantech3d.com/files/mejirowavinaros.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/27923551198.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/rizasawaxebegisumekaxibi.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/94853338606.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/vixorigenibirowogapa.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/tidedapazotanuxufox.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e204a29218---dojowuxubiderul.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/pn0ufnoo6mn7koie5b3o4vv026/kudapusinijup.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161411873ec180---lijukudofomamigaw.pdfIn PDF document text
    • http://retailcop.ca/files/52829556767.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/pizijunoviwufej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mp4+full+moviePDF 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_off0000fa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 19704 bytes
SHA-256: 44e736e7632dbbd288e12ef69a0affd1a7dbfe454a83cfc4748e4724f695dd25
font_01_sfnt_off00012d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D64 10124 bytes
SHA-256: 1bbc76b98c42853c5cbac627e2e3c838443983a7d284cca6883406ff5e94f558
font_02_sfnt_off00014410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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