Malicious PDF — malware analysis report

Static analysis result for SHA-256 73493fab97eceed6…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 11:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06cda5205919149918b4f7f241fa9311 SHA-1: 59f2967b066ae5678726f502dc9e847cecff04c2 SHA-256: 73493fab97eceed64eb1f5943f65055c7088e37a32b01fa85c1370e2c707bab5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on compromised websites. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rustproofingottawa.com/userfiles/file/81697507964.pdf In PDF document text
    • http://brezov-gaj.si/uporabnik/file/14104465245.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ef1211a8a6d3b0d39442ea2fcc64a143/lologuduvajavifedi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/61245d8e13acd32dfdf7afa3e033f6e9/50262510584.pdfIn PDF document text
    • https://codecs.ro/images/file/tarolamumadaworeluramovo.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/besokojunozebo.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/18357305969.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/54136862282.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/fuzuku.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/94990311674.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/168255048308a3bb16e9e8d3ffacf6f9/17600831402.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/nezerinixawipol.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/zozela.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/46818060624.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/86294262800.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/turuzewid.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e08a399ce84---depog.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/26830146998.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/kebiguxikub.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210524/210524201612481695yui4sg4w5ome.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5e8c6694---pelisefatesisudewigigow.pdfIn PDF document text
    • http://deauville.ru/files/file/2117210202.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/zamoxinewejewijabe.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c546b9c1a05---64763259321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=perbedaan+penyakit+arteri+dan+vena+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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 16012 bytes
SHA-256: 88d659ec3f68e6834c7c5021018a8bf90f6acebfee9e248fb6e1179f0c016c29
font_02_sfnt_off00011952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 10572 bytes
SHA-256: a2e43b2ba8d51eb056495ed294a0b82c37fcc7f74b4e7d17cb93b01c523e96da

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