Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e70570487bd682a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 08:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e34688b8794d66f93c944c83d58bfa8 SHA-1: daf8fa64b2da8bacf0fa4f8f2c138645780f4737 SHA-256: 1e70570487bd682aefcd3cc0c10be82613be54dfd8fe49c4e6bf70dcd1bad922
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of phishing and password-protected archive lures. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute payloads or redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing campaign aiming to trick users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://krisoc.ru/uplcv?utm_term=telegram+apk+download+for+windows+10 PDF link annotation
    • https://berbagiangka.com/contents/files/86025802468.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/88207266845.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133c65d3929a---3850938635.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/59443398334.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109161644278156.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/vetepowoxobu.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/zefobifutigakonejon.pdfIn PDF document text
    • http://bdsductri.com/upload/files/kajibakunawajozetid.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6719d5094db124431ad2eaad88deeb0c/24016571789.pdfIn PDF document text
    • http://riviera.az/userfiles/file/kumejukososetug.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/121111219.pdfIn PDF document text
    • http://sakem.org/userfiles/files/lobixavexazudasurabizopo.pdfIn PDF document text
    • http://qdjshg.com/files/file/83116343274.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/wogurem.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/446c80cb2d84d7a95fed4677cdd207fc/32061748639.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/kovuvijoragotuzopufapoduz.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/90391022926.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210912142111.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/serexomosokatud.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jazinuziji.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/46608161881.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614928464001b---86230395148.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/gepepitewexewemusazebuko.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/36947310655.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/35123167802.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/49d25927b87175add01d26af1e0cec8f/71077370125.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_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 17036 bytes
SHA-256: fee3b09afe528f35b00a06cc026f84e5d38fe7a079a259968008c571c15e58e5
font_01_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 11060 bytes
SHA-256: 6529d2627989746eca7d4f1b8f272008eec20b410c208292c0cc94cb749ea946
font_02_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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