Malicious PDF — malware analysis report

Static analysis result for SHA-256 684f8324d0fa7d44…

MALICIOUS

PDF

86.1 KB Created: 2021-09-22 22:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77301ea8c11ae050f61b7c353939d6b4 SHA-1: ec3a0f6ca47c6d8836d5aded115f40f855188f32 SHA-256: 684f8324d0fa7d4431646ed0b57fa6d7754a3ff0b743e080d961644fe8c1067e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier also indicated maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://frutapac.com/ckfinder/userfiles/files/bowalas.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c655251b8---sazigivaluke.pdfIn PDF document text
    • http://saint-party.com/media/file/78764772177.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/fosasaxuzalanokowek.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/1pmob2ph5d80favmr4usuf05k6/figinonukiku.pdfIn PDF document text
    • http://bigbulkbags.com/survey/userfiles/files/botozibaferomezi.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/76789001653.pdfIn PDF document text
    • http://uat-tunisia.com/userfiles/file/94473897641.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/nigedexumixeg.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210914_5C6348298742851D.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142f0e03ff70---86672167909.pdfIn PDF document text
    • http://gnox.vn/upload/files/fuzeposokediravile.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/zimupibuz.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/tatavexiro.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334ca0494c---88314516123.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/39789375203.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/nipifebubaferusu.pdfIn PDF document text
    • http://hak-al.com/resimler/files/fepevinoja.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/88766356561.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/31214178059.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65c98eb11---36403540522.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/99507692051.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021092302302673499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+alpha+sapphire+randomizerPDF link annotation
    • 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_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 10712 bytes
SHA-256: 4eebeebf24ea6c248916073ce2cb7b423f17008666d5338a19002f2d7151c6be
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 21980 bytes
SHA-256: 33f47bff8b00098ade059d7365959b0f12061570abc4571565778b48fc82f517
font_02_sfnt_off000132dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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