Malicious PDF — malware analysis report

Static analysis result for SHA-256 2367c72ba1013873…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 00:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7740150a46247b9d98d34259f1dc5703 SHA-1: ed87a0b0478f24a38c84a6f499bab29ef72eab07 SHA-256: 2367c72ba1013873b7e3708934ec96cba6c1651c03ac4fdd5dd6bfaa0e85f0ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates a potential for further malicious actions, such as downloading additional payloads or exploiting browser vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=nba+2k+mobile+basketball+android PDF link annotation
    • http://yearbookplus.com/uploads/ckfinder/files/gagunonegazux.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/65412630984.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/88547080555.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/joxim.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/wapozitebumokodiwekelozif.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/77834628380.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/tawilano.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/pegizeruwufewok.pdfIn PDF document text
    • https://negaratoto.com/contents/files/pibenokunasuwa.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/polemokezilipolu.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/mijudujinabawopodata.pdfIn PDF document text
    • http://sbairs.com/datas/files/77630261259.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd145df34---95575866477.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/kepipepelekoxagobipirota.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/78586038798.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/ripatuwubupilusamulek.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/dumaxalub.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/78324985834.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/4883007999.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/15150531326.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/30356143255.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e85969db8---76972448760.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109090559354651.pdfIn PDF document text
    • http://o-dance.com/upload/files/zijuwofoxapevukuteja.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/81693432439.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136add7071d1---49217372031.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_off0000cc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC45 10736 bytes
SHA-256: 4ad7dab163e8664a86544e176c7e39d70f79d8b7843a7cc120e2b68c0647a475
font_01_sfnt_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 22232 bytes
SHA-256: d86c930cdf59df17f2c457b2c7e40003a56cef8097f0d7a18a5f96f92a733c03
font_02_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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