Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9d92e400ab349d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 09:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e769d9091d2bb8c55350ba7807c6dcb9 SHA-1: 03de103c9ca8d24ed39fb0cbc4d2570c872ea9ec SHA-256: 0c9d92e400ab349d7ae5cc79bfacf0b580eb375b5301a18e35084057c23114a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious, along with heuristics indicating a link farm and compromised CMS uploads, strongly supports a phishing or malware distribution attack pattern. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://queure.ru/uplcv?utm_term=best+anime+streaming+apk PDF link annotation
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/10230439673.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/55402603694.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/86255265425.pdfIn PDF document text
    • http://msiutilities.biz/documents/45531811863.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/747h8sc1fd6q2t3i2um4hduq8f/13280045588.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/kikinoxorusere.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/96534741915.pdfIn PDF document text
    • http://btfa.tw/upload/files/64936500981.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210906210513.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/85210996945.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/87720318695.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/69781402997.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/12694574410.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/32730973309.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f954a27318---baxebopimasugimuneza.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/42632278834.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/22834188678.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/suxupipi.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/95739958425.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/50463316883.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/92372091870.pdfIn PDF document text
    • http://willbramephotography.com/buxuwovifabezawezade.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/guqdif8g95f99mmsq31s5he3vr/xovuxugotugu.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/50897175451.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/puzarulasetetameket.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/lulosobijogunozoge.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/nikagebesoxu.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_off0000b6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C2 17808 bytes
SHA-256: 102c809b4efac534d9fcaa88df40a6068bdbd815a7d061179da0edd80e3d50f6
font_01_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 10576 bytes
SHA-256: a9f4206a7c56d23f0338f053014fd4a579713b67a9bd820df11f082e3565287b

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