Malicious PDF — malware analysis report

Static analysis result for SHA-256 898a1b6208d63fbb…

MALICIOUS

PDF

87.8 KB Created: 2021-06-25 21:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b63a492232ba9d83826dd08911f56ed3 SHA-1: 077fb40f16e7571f3cee865be49bbd08a5257708 SHA-256: 898a1b6208d63fbb039b562d7c96f5d628dd8a13ebbec18364c862a5d0f4691e
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. It contains a link farm pointing to multiple compromised WordPress sites and other domains, likely serving as a lure for users seeking online PDF editors. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075dfd62894c---jawimutawutise.pdf
    • https://argumentua.com/i/file/23119126542.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/62807442979.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa4a818cb---vetiwokuxuze.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080697b15dc0---feverosafodedoramatumepe.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0va4822lm69mtdm61athr0am3k/67407079409.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072984a53088---73900735029.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/nukulisimi.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e610bf19---20219232917.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/890629757bdd821972122950b59e5176/86113170541.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/h00l3rhjqr2dqfnuaamve5t602/vuxapiramakixosaxusi.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/78896056847.pdf
    • https://exporoaster.com/app/webroot/files/images/pages/files/4754706654.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd1d9c4b6---ganakobixinalulidokimup.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/32646945775.pdf
    • https://rosycaffe.com/file/vunarewasodijupesedowujax.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d6dab25065d0aaecffd8871bbb628dd/kakol.pdf
    • http://pospatrans.cz/UserFiles/File/56127190431.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c978ca10---zebetij.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077a84f48e---65922553240.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085dcb2dc8ca---5369136927.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/9117671890.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=online+pdf+editor+free+download+for+windows+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 16792 bytes
font_01_sfnt_off00010a3c.bin
b29c34e8427508bc17b1ec88707a8b58a090b2c933eb5b64a7fc1dc862d4fe9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 17584 bytes
font_02_sfnt_off00013889.bin
a3d6ff3c49e1d05cda5b9725c87f609173994855de9ac4913cdf8e5e989fb1ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x13889 10776 bytes