Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4ddfce9514ae70…

MALICIOUS

PDF

74.0 KB Created: 2021-09-15 21:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1ceebaa7a0d3918e9f9de953a357e5fc SHA-1: 594eabb124962613567f3c9d91c8468d5a5ee204 SHA-256: dc4ddfce9514ae709902a75349e2746a3a5f5fc241ad9054d690fa61eaabd68f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=vasudevan+biochemistry+book+pdf+download PDF link annotation
    • http://cana.vn/uploads/userfiles/file/ratede.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/xopifokuwijefarazozuxo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab94265d7---ziwobaxa.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/13978103111.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a3e1945e0---dazagosa.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/gisesidadowivoniniwuwowak.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/79660870955.pdfIn PDF document text
    • http://4bx.pl/public/file/28229329359.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/65995473264.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ak4magelqlr8hcglgogr30cq4/vapujilubusitusibapepe.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/mesuwupejawuri.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/mimagidozamiwaluzezulitup.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/veraraxuxawubeka.pdfIn PDF document text
    • http://jfe.hk/userfiles/89498195973.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140764401b15---sekafejamowaf.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/rukexudomuxegixu.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/nozefukipab.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/86508645135.pdfIn PDF document text
    • http://novichiha.ru/pic/file/19429079871.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/15519304824.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/dixojobin.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd2726d726---98945029675.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/30418302922.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/75579952378.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_off0000bb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8F 16792 bytes
SHA-256: 16808e17fc83093f972547459313be8703db4664f13cf195b72797e125832595
font_01_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 11452 bytes
SHA-256: fd26ba36b07e844a9940d147d0a9931b8118ea6a55f7f8b044bdda64f65e437c
font_02_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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