Malicious PDF — malware analysis report

Static analysis result for SHA-256 019500694d0a7c55…

MALICIOUS

PDF

88.5 KB Created: 2021-09-07 14:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7008780042215e366cc406d8dc63ffb9 SHA-1: 1be70457710babd3728b72d88bcb6f5586037ac3 SHA-256: 019500694d0a7c555251a9bd28bad1ebe7a774d58bf58b3a101f54d6ef35892d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. One URL, 'https://laborke.ru/uplcv?utm_term=irs+form+1040+fillable+pdf', suggests a lure related to tax forms, consistent with phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=irs+form+1040+fillable+pdf PDF link annotation
    • http://sam-global.info/files/file/1150306089.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/52974125186.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/nijivenufilodifobaz.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/98458549391.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/dadexisuxusolavob.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/zerevexibaxorulibafola.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/64541866510.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/dunifa.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/madozizuviviku.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/zanuxezeganuzimotura.pdfIn PDF document text
    • http://brlairport.com/images/file/dufotirikof.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3fd0c86ef---97286292732.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/nnd8766t66bssgd48gdvk4eb2m/nebitodarudobal.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/tikasosuxuj.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/77776514624.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/dujujodiwodo.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/lemomovoz.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/worawo.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/62710595606.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/zufix.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd98f63370---25374581408.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/jinubagemozujuxonamiwus.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6546e12e4---verevaguzuwoseraj.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a90588d4ffb47d0bd4c0199c960b9318/2603130805.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/10e6c51e4e02b8358c04885e37534528/pipiwagiburijaxex.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_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 10800 bytes
SHA-256: 887e58a25cae9357ee2d888f66f8e86f076d444d91c188cedb1835ac7495a80d
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 19472 bytes
SHA-256: 74c7e0f6d3ac547faa74165d581e50d82bbcd8260733be86ff02f1401a9aba6f
font_02_sfnt_off00013cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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