Malicious PDF — malware analysis report

Static analysis result for SHA-256 804da1e5b8ee575f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 17:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f220d96fe1b16c0590acfe00aca1ca2 SHA-1: 34f2fea6e20086691c8e6c5bbbc11cec5cacfe37 SHA-256: 804da1e5b8ee575fc582068ba2b98b30c8757c0c586576c12bc0256a66ca22c8
156 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 links, many pointing to compromised or disposable domains, designed to trick users into downloading further malicious content. The embedded URLs and link farm structure suggest an attempt to distribute malware disguised as legitimate software updates or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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=google+play+store+app+download+for+android+mobile PDF link annotation
    • https://yourownadviser.com/ckfinder/userfiles/files/robesatupetesa.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/sudolurawuxi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614232b3eb093---49680042544.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/295545af4fbc9b6158a5b61bde4a44df/20780283785.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613f15b51da44---vepovezolulipuj.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/nivagiwifegeve.pdfIn PDF document text
    • http://yejida.com/userfiles/file/23720421889.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/luguxeduxu.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f547986abb---24371170951.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/76739032058.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/vorepido.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/97688994910.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/86204770583.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/83585123506.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/jejifemegodutibevizusos.pdfIn PDF document text
    • http://htygroup.com/upload/files/biwasilulunekuzo.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/18372649838.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/76747375807.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/68715026006.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210919/file/88414377576.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/24b8e8afe3be910756658f608b98870d/jezenun.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/62687032623.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/51135960108.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_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 16716 bytes
SHA-256: d575810e45c28e3a863114f496e92dc99638fe8b148ea8ad0dde67e22327b50f
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 11220 bytes
SHA-256: 49ca2b6a2bbac5d747ea1815791c7b2a0cbd31d8f7fc2c2f1b12894481897ef7

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