Malicious PDF — malware analysis report

Static analysis result for SHA-256 185a7704eecfe4e8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-24 01:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 168d9249ff35ba02599af4737dd7c0b0 SHA-1: 5b4471008dabb61dbc69685b8e8c414e7d1dfce6 SHA-256: 185a7704eecfe4e88710cdccaf605eb7afe1f7144d395778bbe584cbc52cb9f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic firings related to PDF link farms and external URIs strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=score+hero+hack+mod+apk PDF link annotation
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/6k10bmg8n43u0ctd2lpe7io21j/nuratumojevamulupavu.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/noruvomikotigizibujet.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/jazaz.pdfIn PDF document text
    • http://alltechsro.cz/files/joxetuxidibakeno.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614091d0d3810---7766850370.pdfIn PDF document text
    • http://fygl.net/uploads/file/132330556103.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-15/images/files/48940882730.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/kudifeforagugusew.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109221805143668.pdfIn PDF document text
    • https://rm-parketi.si/uploads/25617517988.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/86882915370.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/mazataxaxawep.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/e64a6vu0v95c39aktc0f8nebk1/dugokewinusajebanilulufor.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/gilanokamunabozupogulatek.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/84645188724.pdfIn PDF document text
    • http://uhorder.com/upload/files/dofapusegelunerad.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/suvisufonepifud.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/vedapira.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fddcabe91---98883748931.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/26066597064.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109231631371110.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/70068545605.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b7345fd13747e95b7304f0664cf1d07f/wonopajik.pdfIn PDF document text
    • http://seamacros.com/upload/file/31106118681.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_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 17236 bytes
SHA-256: 36ae069e0f17e523b0b8b51f85e2aad85b7ff9934bf07f7d4db4c2a517a66262
font_01_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 10436 bytes
SHA-256: 69ed4ecc0b999d9b5b77e59685327122f9b95c458d4a1d72d25091fe4b620d8c

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