Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bd3628cdc3ccbe…

MALICIOUS

PDF

83.4 KB Created: 2021-10-08 16:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 45f7c650cad2d1345ddb9086b88405da SHA-1: faca5bddd920ae579a7f6fd6aa1495f9292b419d SHA-256: b3bd3628cdc3ccbee73cae745a6516a8f0f985ca959e485f191efc11acf207ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a link with 'utm_term=data+in+file+is+corrupt+and+needs+to+be+manually+recovered' strongly indicate a lure to trick users into clicking malicious links. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=data+in+file+is+corrupt+and+needs+to+be+manually+recovered PDF link annotation
    • http://guerrazzi.info/userfiles/files/465438625.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615814c07d7de---resinomitoboziwasug.pdfIn PDF document text
    • http://grandfiltr.com/files/file/bupepowafimu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16130acde31fb2---72878383846.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/85892605347.pdfIn PDF document text
    • https://gangnampools.com/contents/files/vijaxutenu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310857e6801---1588455193.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202110011633044912.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1615f03370a3ed---57314317221.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210920230238.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/74182420486.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/34470220464.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fovixozivigapubiv.pdfIn PDF document text
    • https://partnermind.cz/images/files/23719888877.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/1847359664.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/12534656760.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/69434453191.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20211007070859.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/19563255353.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/80906547819.pdfIn PDF document text
    • http://teifsepahan.com/files/file/jowejoruwigidugojekapo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d5dbafe3---64208209741.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/tiwiraxomevojuvizudebu.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/85642287470.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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 17836 bytes
SHA-256: 8dd27525c95fa8ce7345da3180f6e7e7bd62066190d5a9eb0b9c01e93db2fde2
font_01_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001259c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 11200 bytes
SHA-256: 0d1d0337e6c64f2d8da5b227bf010ad7acd5c89fc971f8654ed59e48a72d57d8

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