Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a46ff8840f1cc5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 10:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 677f03325295059509993905faa05355 SHA-1: 74b39ff08803900f1545d8e79f6f636850b36a17 SHA-256: 37a46ff8840f1cc5137864362a2116112ecaf0414363683e92a490f27426d906
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely to redirect users to phishing sites or malware downloads. The embedded JavaScript, though not fully analyzed here, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://shinyoungvalve.com/userData/board/file/nojajemagiluzukarugezat.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613265441d479---sazixuzixadiwapupugow.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/xesewoz.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/vikamu.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/topaxufazuv.pdfIn PDF document text
    • https://eguiders.com/uploads/tukomarel.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1inqk6r5i76a4p0doja16mr2if/84459062102.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109100705558279.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/21201814603.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/febogekezaxi.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/71371816896.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/jizerimekafitovudev.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/52679236287.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/79113882086.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/jovuzusidavino.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/vikusidanufopasenipel.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/tofid.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/78875616858.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/49610465687.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/nefobibimadubatapotuga.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/60679114475.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/da43f3e1c25dab5fe6ddc8478b7655a1/kujujufakeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=intro+to+android+programmingPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc10513aa---sagok.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_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 10340 bytes
SHA-256: 0ef585022c28e2e5b17c185d571ee6facf4b7928fc969d8d95115ab0bfc6b503
font_01_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 16940 bytes
SHA-256: 273e4a77fea161ef0144337da8a413bedefbc4c8fa778506ac30107953f367b2
font_02_sfnt_off0001296b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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