Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dacb521275f5d95…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 02:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a4c37992066376574a65a8174ebda09 SHA-1: fd060f983b9e1b1c88a6ae5ad1cb618ff18dc5ec SHA-256: 7dacb521275f5d9538b0f9ba8499f2bb49b06182c9dd7605c1a41d92b8742028
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely lead to further malicious content or phishing pages, indicating a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f4a79bebba1b2743a6bf08b09f8b1e95/kesupazifolawizoted.pdf In PDF document text
    • http://lagerunda.it/public/upload/file/50980084050.pdfIn PDF document text
    • https://olterus.org/contents//files/47637879240.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7572b95c41---wudalivulunababimipig.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b55d5d4e3d20d137cd95e42773fa42fe/56848491773.pdfIn PDF document text
    • http://apex-architect.ru/images/file/83402795233.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/54704283620.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/27742101811.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510083237316719.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/mogubotaliwepizix.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/62526326423.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/wibivanuw.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e419bd2273---govexirodesozaxa.pdfIn PDF document text
    • https://silga.ca/userfiles/file/68031231326.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9edcca8f02753d3907bd47d125bc8bbd/nuwulo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c5a6755bcfcc8481eaef1449935df740/ziwever.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd16614309---80225495042.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/feratojadaxa.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/tesolumisokoti.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160adf775428e3---73295403801.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120d96aefdd2---memawogevojisufedej.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/22087521562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=counterfactual+history+pdfPDF 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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 16400 bytes
SHA-256: fd56b8f11d3642874adcf610dcbfa2eb9d73ca87dc2542693eb419c6c4e1b098
font_01_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 10960 bytes
SHA-256: 240c1348e5f08c56289273d4783be93cadbce597f07aaf095da5ce76324ffbf4

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