Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1b7c258c135f7a…

MALICIOUS

PDF

69.6 KB Created: 2021-09-07 14:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b732764a0ec2e91c58ae9a54e7d63e1 SHA-1: 3f7233292cdcfd17689c4b54d3d04f9aebcfb2fc SHA-256: bf1b7c258c135f7a8773725a259dbc4142f6fc0ebbeeb2d546d95f5fe3458006
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's primary function is to facilitate access to these external resources. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://irlanc.ru/uplcv?utm_term=respuesta+inmunitaria+frente+a+virus+pdf PDF link annotation
    • https://efsanepin.com/calisma2/files/uploads/30867873084.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/31124128526.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e90ba37c1---mikeragojekunosim.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/31995956421.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/75881850346.pdfIn PDF document text
    • https://unosms.us/userfiles/file/xeloseludasezeke.pdfIn PDF document text
    • http://ocean-ex.com/images/blog//file/wudin.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/87277157663.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/gemusefipu.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/bapurawejilezafuxujug.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/fc8e80ea8fe56bdaff269fd2e9b8bad0/kurovozufudupesufomu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/44539362857.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/2725047023.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/vopoxuziser.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/mafeja.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/7035e26f4a18eb6297f50c0f41905c22/xuvovufivinalusoku.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/79862520130.pdfIn PDF document text
    • http://sns.hu/_user/file/zowilavoso.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16113a75fe8b84---ravovufo.pdfIn PDF document text
    • http://praguetransfer.com/files/file/14015080519.pdfIn PDF document text
    • https://betibg.eu/webroot/img/files/3017856115.pdfIn PDF document text
    • http://finvestfortune.com/admin/userfiles/files/16824130862.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_off0000afc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DF 10704 bytes
SHA-256: 76fe9734b563015bf09262f48627e5b7bebaffe3d8bdddb2c3a07e25da0f6a48
font_02_sfnt_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 15624 bytes
SHA-256: 33b01c487fa59b18b9c5ac478b445bb99a59636b83304c83ed5c3cc37924df8b

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