Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da413844f35f09b…

MALICIOUS

PDF

95.0 KB Created: 2021-08-14 02:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab6f412c9f39c7327c815b37d981f901 SHA-1: ecf9665097f14174d012c2b5cf76115aebbf6067 SHA-256: 1da413844f35f09be9fd44d6a60893b9d266d07ae22eb2f8d14376d45e1d15d1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous external URLs, some of which point to compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://ahl2005.com/ckfinder/userfiles/files/nonuga.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098433b2e865---52686426157.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/suzowavobowomovagot.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/podibi.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610823bade75c---82955693817.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/sakakuzuwima.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/11483339650.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed0a7a322e---36572589537.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/42013517598.pdfIn PDF document text
    • http://ibb-online.ru/f/file/xevuvelixudu.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/kariterunid.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/wekenobano.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e85e09bce5379d3a6fe2cd185e2ada53/53185747887.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/jscn9bn99sce4h4la7ov8kucp5/busumisafiniw.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25b3f24a20---42856639954.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/67529e06a74abaadbbdd11634a61aeb3/7680200539.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62c6a5c10---88535759025.pdfIn PDF document text
    • https://kawanmto.com/contents//files/15922046472.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/73147632662.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b4e36941---67359483006.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9df93eecc5---vebakeposigizunitelatod.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d474c5f30---2820635023.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/72317354027.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/pexigurutabekiva.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3bf1ec1f---rerepigolupis.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a48bb78f7---doluwojojisenax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+end+a+good+resignation+letterPDF 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_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 17008 bytes
SHA-256: 9f882a250245dc1413a87e86667298a514aa3eca3b5173da643ba2216f3f3aca
font_01_sfnt_off00013bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D1 10500 bytes
SHA-256: 25729f2972d90db8d1fad19e01565aeaf51e02326eef3286a74eecb9b1cc44dc

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