Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8f51c8b9e2ee0b…

MALICIOUS

PDF

84.7 KB Created: 2021-07-02 20:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 976599c3040dd5d58c9c9e307a2fb9c8 SHA-1: 4486d36af5707a223132cdaecc1182d0956951fc SHA-256: fb8f51c8b9e2ee0bfa5939c7e2d9294e7e15288ff3336c34f4ce13cf6c809d4b
196 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress installations and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081de80911c1---60888164616.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646b2487d4---sovuxujumuzer.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/148a11406cbd138cf7b85dd3774d37de/50003993928.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ddebf0ba5727ff5c1aa649538fc1d4a5/5693445338.pdf
    • http://medica-eg.com/userfiles/file/66060414111.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc604ed64---rojejat.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ofgic9h3r1n7kjlb8pd70uc272/balakef.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/bn3lnupo4jivpfitmnerscnb0q/50050605744.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608597f9991fc---94574163601.pdf
    • https://sinarwaja.com/account/files/41275116993.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/377c4886d4762016009b047df6df64e7/wewawenopofavedudebir.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/41af7d04c74a9b48f1a159a3088df4b1/vimonugonozakurukiv.pdf
    • http://jncs.kr/page_data/file/20210611010536.pdf
    • http://alexhofford.com/temp/files/file/nafegazudumibar.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/65151754279.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6fbb0c130f11ca4df0e901ceb2454fca/3299973503.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lezizomoketaxikanofi.pdf
    • https://ambulatorioveterinariosismondi.eu/file/52960074193.pdf
    • http://poorclarescork.ie/images/zugejixejoso.pdf
    • http://argyleliquidations.com/userfiles/files/9573657068.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a86db7bdd8---jesok.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b5203aae805b6033171fe147017d5d1a/31540931802.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/47126095593.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/r2hhno2umi19976gaj8a87bvdu/vinamu.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/tibiniminefufijunipe.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac55391b3f---lugadiguxodajugevodazele.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=photoshop+show+selected+layer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c0.bin
0ef8849c4db0733f9d78395130301e0ba04913b751527f747a9fb4c04c443c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 17484 bytes
font_01_sfnt_off000114b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 16792 bytes
font_02_sfnt_off00012cc7.bin
a423919eba492e0f316cab241f52c115c5b3b884075769364a6c9a1ba18174f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC7 10616 bytes