Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccd59e3b50b3357…

MALICIOUS

PDF

88.2 KB Created: 2021-09-04 18:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3f80ece62bacd7cda572932ca422540 SHA-1: b524faf6718bceb6f39f38894634ed5d1dfb5e48 SHA-256: bccd59e3b50b3357a36b256e47fd6f512b2d7414d1a9bb861b12f16ff56fcc53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely facilitates the redirection to external URLs, which are part of a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nomylo.ru/uplcv?utm_term=jonathan+nolan+memento+pdf PDF link annotation
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/fc4bd27a563d72bc23f7e427e11c088b/32688784015.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/rifufebuf.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad55265e5040a1ed1e1d6df36b4fad21/tojavopufeligumos.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/42113063609.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3bbdc594---xamugipikotoso.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1628195787979437223.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/29120132091.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/kafujifemesadurozuwe.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/frg8n3a9e1a4nej2o1oeaoemle/bexox.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/8391595858.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/fusatibati.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210605_48DE7355A52EECC3.pdfIn PDF document text
    • http://tencanpowder.com/d/files/wipijorujuf.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/82c0967aa79761a86ccd011dd4d4bed5/luzoxanaxi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16102bfc8a02b8---gezidem.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/52681810957.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5613b531d---meripa.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1aeea119e2---bagukupofufubeb.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vo6mnk3hn9ck6idsu1ets458om/33391271313.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/tukadopunakutarikoti.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/8124248513.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8e90cdd64922751ec9678cb52f48c485/kemirazibi.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/54188885940.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de18cd569f0---gegavizokelekoganewaf.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_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 18456 bytes
SHA-256: 9e900dc0923b5d6fea4cfa02c99791e4a434571c3639f590278c762696ff9624
font_01_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 10396 bytes
SHA-256: 62816842b8ee8d64ac81bad60d266fd010b7fdb75437aa07afa48e03aa81fed9
font_02_sfnt_off00013b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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