Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad810f278d98aa6d…

MALICIOUS

PDF

85.3 KB Created: 2021-08-18 23:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7d4333c1324afc153d22ac932f62c5f SHA-1: 995123871cc04265560aa560a3714aadaa32ce71 SHA-256: ad810f278d98aa6d677551aac80db2efefb49fcfc9a9b3b29f210301c6dd0635
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pixomot.ru/uplcv?utm_term=gabriela+g%C3%B3mez+acevedo+entrevista PDF link annotation
    • http://vom-ragnaroek.de/uploads/file/lamililemilatugorimu.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/33426531719.pdfIn PDF document text
    • http://nova-auto.com/upload/20458303603.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ekadei172lrcuhcej9um8ejlo2/57516688354.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/74817993457.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/jvbm4i245efnov3umjjm0au5d5/gavanifumavoludak.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/cc4c5b7462b5faf95a01f42e70180465/38144585377.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/viwovetoz.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078db88d782d---23744565071.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/56719756987.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/98140881239.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/967244d8f1aaa3e996e9f92f02ffe4e4/newimirivopadili.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10e76370df---70864924538.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/341360d93b5adb70014af512b7646998/pogafozerasezazobujazamuw.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/13874695683.pdfIn PDF document text
    • http://safetypath.net/cms_images/52131201898.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/buwarizovozam.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608151bb5abbb---matabukojanitopilubabawu.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/92220259930.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/bifeveriladepexijipiga.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97544306ae---guvabutaxufoviguvinufo.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/jefalifonilami.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/lufekemam.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/gji0geolsff1jaabp61mh8l1e7/75211513069.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/la85ujmlir0f2jloud4easr13a/xebuvalat.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_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 17956 bytes
SHA-256: c2eeab526733da50ed5e19f775109d9ab8533dd7030d53511d2f94f7cf8014a5
font_01_sfnt_off0001130a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130A 11156 bytes
SHA-256: 83c41abe01c5259aff8b459e7837e3a8ee808dd67a52aeb00cb41b46b4c32bb7
font_02_sfnt_off00012cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1