Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b448d1b299df05c…

MALICIOUS

PDF

88.0 KB Created: 2021-08-13 12:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d0c175893e45c84978ec3b4667802174 SHA-1: 96c9301b6565fa8690adb90e2a49369b346fb481 SHA-256: 5b448d1b299df05ca034db1d9d2fde6e4666e1faa53b134168330cf20802bab0
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://bazab.ru/ckfinder/userfiles/files/pubodej.pdf In PDF document text
    • http://hongshengfish.com/uploadfiles/2021050821190040294.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/37571237486.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afbfa0d9323---kevox.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050412480573499.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6bea7fe26c5eb88e189c7ce09560190e/47505836695.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/sodavasub.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/5939128713.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53c33ea29---viloxosi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tripiea1h771kfhqtvuo3snsm3/gugavinisazabamapodudujel.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/vepokumubufataduz.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/digini.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4865cdc25---redixoviloduv.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/26452872718.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea2925b1c---20847156652.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/femik.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66e6f6159c---94190818601.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/tositasegilezaxe.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d89a067b5c4---5891923156.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/dafiparete.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/niton.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/17ba0ce6fdf98e3a9a8dfb4bad411893/96255758618.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/82983336188.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ld75tvtb31sac28em5n3ov22qo/kajuzarufidezefawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+do+landscaping+in+sketchupPDF 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_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 10960 bytes
SHA-256: ea839b7efc11bcdb6083ee604b0a15fcb548d014bd8201a5417914f0982af67c
font_02_sfnt_off00012335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 18148 bytes
SHA-256: db92ad257b9561b061fe85f0f49ffad595aff1371ebfdddd7446c979dbdbcfa7

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