Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0b6b08d97c56fe…

MALICIOUS

PDF

71.0 KB Created: 2021-06-18 12:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ac56f52fede799c61d4cf44530e49e6f SHA-1: 5e7c738ef807b680ad9f334785340d0b86c4fa45 SHA-256: aa0b6b08d97c56fe4b902c1a849eb6e7a0aedcd8e8f7e03be9a00852f34265a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple external links, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially obfuscated, references a quiz, which is a common lure for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=what+would+you+do+in+a+zombie+apocalypse+quiz PDF link annotation
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/6d0bf4a18749b0873036b6d1b34dbaab/kusixabijewod.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/76721e0d89d8a22d7d8245274ee5a8db/47569571530.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160773cb85f42e---35275120608.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/euc2qrgghkj09rnbndss45g582/rodatuvekajalapalapamem.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/tujafo.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/rexidojo.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/relewadunomufaz.pdfIn PDF document text
    • http://springbook.no/files/20469683229.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/115bfc642c5d5df4f20f013ffd57fd38/pulajulalal.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2240ea09f---90082088787.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d876fa0f31---nogulenajupexozaluvodene.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/a0c3cf3568dd1cad39bfbb619e7d2ff5/59070131522.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2a2dffa0---58786894891.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/vefevexegenez.pdfIn PDF document text
    • http://robalton.es/Albums/images/file/%5C/15985275427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 5740 bytes
SHA-256: 19bd12b3378b1408813599e570359b58c21161daa8542615d9633dd7881fa0d7
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 10604 bytes
SHA-256: 3e8efeddaa92dce6dcf4360d79fc7fcc562e09f4c65961292f0ac2058c601690

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