Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d4a8fdd1fb6c41…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 09:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 648b71368d906c1e5ccaac6ef19c81c7 SHA-1: d34ec9566ed4abebd58077ba15678b7358c752c3 SHA-256: e6d4a8fdd1fb6c41955a1f7340d4918686c9b3f5f4bb2e5f140ec419314a3ba0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and the use of UTM parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://queure.ru/uplcv?utm_term=giddiness+in+telugu PDF link annotation
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146777f42317---14326648197.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/nekjcuvengf9idolq7gar74igt/pilafijokukalemefid.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/giwisosijawesumuvo.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/87836516812.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/lejakadivirexelifij.pdfIn PDF document text
    • http://wamer.org/userfiles/file/14292576962.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/nafexofebamonixupulewu.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/mexor.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/wusimunexuxukepog.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/limimugukoluxe.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210903181648094.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sevilikodozisojuju.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/32549936884.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/bivemanetebazufe.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/211367faf0f9d47e5b3faf0954a3d30f/vozepofalajotu.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/watofaxopanutisapotem.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/wuxosatezuxabuzigagizo.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/lolexadefanofora.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/62103919007.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210907004936.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/renuwiweguwivofumamiboj.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19B 17264 bytes
SHA-256: 99547ed2671c62a69b8fc33bf2af8436a308cbb63fc8bcbee4b3781f9c1b7ce3
font_01_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_03_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_04_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 10180 bytes
SHA-256: 9489b2ceb61f59335af155d4dd4e2020762c6d0fe6ab689758bcc01b210934b9

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