Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfd0c15d72e3c38…

MALICIOUS

PDF

84.5 KB Created: 2021-08-15 16:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 048e4ef71487f2ba5646991f0a155452 SHA-1: eac88fd2bc74272460d523ba609114571ee41eae SHA-256: 1dfd0c15d72e3c3802f3e9d183023de81644d81e40c4734a38e90da25ccd96a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised WordPress sites, suggesting an attempt to distribute malware or phishing content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with numerous unknown reputation URLs pointing to PDF files, strongly indicates a malicious distribution scheme. Although no scripts were directly extracted, the structure and heuristics point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160820c29cb610---dorojuresufugajumegufi.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772d1db37a7---79728573874.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf6d035d8---mimowazajoxusel.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diwaberemubuw.pdfIn PDF document text
    • http://getvisa.ru/images/File/23690480020.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3259c7475---zitefuxeki.pdfIn PDF document text
    • http://flexa.cz/docs/file/90779554522.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f3b00821d4d376f10f20e0d6dd3d3f29/morawedazekogegebinak.pdfIn PDF document text
    • https://peterdegendt.be/file/51197229028.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/93036701779.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/rasoroxuxipidovumoradej.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5ecd78d377d7dcd8357878f0ee339670/xalulefosokalofolegarifen.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/23618550401.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62fdb62fdd---tunex.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/c66dc3vko719itl21143bnjl1p/45769043267.pdfIn PDF document text
    • http://wami.cc/data/files/zusukorevewejekekuf.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/811e1a78ce35b5e40977cb656f6506b1.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d1d309d7---16736374040.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbee81a28b---bovozaju.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/sasubasujekarodivov.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b8b7e92d06f083dedae1ebf61e1a7b38/79640522689.pdfIn PDF document text
    • https://megashina24.ru/files/files/newenugujudakuvunufizoja.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/nuzurejukapesulurupelemij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+kinemaster+pro+mod+apk+for+iphonePDF link annotation
    • 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_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 17292 bytes
SHA-256: 33bbc7899da1a08d9730c0a42f647a78b8ee008bf842c2b599d287feae34fca5
font_01_sfnt_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 10940 bytes
SHA-256: 46cb53fdc6a30157d23f981776539c612a78c3824f6370402f09350aab70eca1

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