Malicious PDF — malware analysis report

Static analysis result for SHA-256 3266c0ab3c9d9308…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 09:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ed2bb07ebe148246381d4a66657af8e SHA-1: a232dd3c445dca5c527597cad8e9e79d007cc7cd SHA-256: 3266c0ab3c9d930841ef5a9bd04dab5f74f1b920e78c471b08804adbb483069b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to external websites. Several of these URLs are hosted on compromised Content Management System (CMS) upload storage, indicating a potential phishing or malware distribution scheme. The file's structure and the nature of the embedded links suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://coretry.ru/uplcv?utm_term=totes+mcgotes+meaning PDF link annotation
    • http://logtech.cz/foto/Image/file/pazurujuzo.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/15279847720.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021070812194761.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/pifemevefukixavidulok.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/38qt82def6u7i0c2vqlf6530m8/tidijofol.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/96541232458.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/iqvto7hhrntsgnnsje49hd5igh/putopogivamas.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/29259901629.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/bidamevi.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/birevixufulamikafu.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/pejeziruterawinowovag.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/sejav.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/n0ehakcfmf8h4fuqaskn9vbhv3/68696918763.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/tagogikerifegonusuzupixel.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/nubofav.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/bolenutir.pdfIn PDF document text
    • http://zatacorp.com/upload/files/wapados.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/55882758743.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606edbc3446cf---pitiguzixosusarigazak.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/kafivemokevebe.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3eef95fb5020ebeba4b716b8796cb1b7/1030190986.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/jugebe.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/wirala.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/oq4uv2bg5es3rju1tc5bcocbkf/vufowutazobop.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160888c5bdaad9---27267922362.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a49a7ed4f4a6895b7f6fdd79bed09abf/losuluxitiwapipil.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_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 10388 bytes
SHA-256: 81fa3619fe04c79ca8596522a947ceca9ee9ec645e2d9ae018a243a558bea2bd
font_01_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 18928 bytes
SHA-256: e96918c465bc248d7e90fed2784776ebcf03dfb76c5df7e9c92161b21458ff0a

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