Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a8b21a7d9e3438…

MALICIOUS

PDF

99.1 KB Created: 2021-09-04 20:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a497dba0264811d459727d9e063a64cd SHA-1: 47141dc571f1dbb9921b74e9522e9f846b054e41 SHA-256: 87a8b21a7d9e3438aa3451c033e8e4722e0acf767e35c1c87ad4946545b832d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment delivery method.

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://coretry.ru/uplcv?utm_term=intellectual+humility+pdf PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa5865e2f---17090662615.pdfIn PDF document text
    • http://iworking.vn/uploads/files/49142176128.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/79068522489.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f50956bf55c2a1a5770a103eba0f5456/20904355624.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/pofebubakezop.pdfIn PDF document text
    • http://josquin-capella.de/download/70485101767.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/bupowamanelewobepizajipi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/54ec03b6c243398125d3fcb1c10b2152/89754546096.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/93418071145.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16076e54f556a7---62438436478.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/fifafoxorisoridam.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/xeruvatavuvidufedad.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/gelapuwazesosogodowel.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/2638990209.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/42568089280.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/zadulixiverazuwifixi.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/labupezujoguridupezaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c711291781---2981750588.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210904_BD1A9D567FC17D2E.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/wofarunujibiwolofesa.pdfIn PDF document text
    • https://peterdegendt.be/file/vokuluwu.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/moxurisesajanerojaseno.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/genuluke.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_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 10660 bytes
SHA-256: daacda9b971fe48a2d29d9845ec09b91d8d1189c9113e00f4b078a260a075324
font_01_sfnt_off00013775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13775 18648 bytes
SHA-256: 0f256b84062e4d03cb5859927f4faa22632b9d72c380c4c510181837111127ff
font_02_sfnt_off000166f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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