Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f70eb308e48537…

MALICIOUS

PDF

88.3 KB Created: 2021-07-29 23:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc3db38dfc3a3a8f8ca1bb3f552e2075 SHA-1: 143336c6b93a8ed94ce02bbf2525041db7c87414 SHA-256: f8f70eb308e48537c8ef3f86223eca706286d3ecf62162c3b3f1d13f2eeb0635
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://synerhu.ru/uplcv?utm_term=what+should+my+3+year+old+be+doing+uk PDF link annotation
    • http://mariopresto.pl/userfiles/file/wiwamukepoxezidopolebal.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/525854548.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9625ed49a---46426116510.pdfIn PDF document text
    • http://changdahk.com/upload/wodakakadefazidimororiz.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/22542520450.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1230d5e0f014e200dd31e2025f170314/gikaviguv.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/guzafebaba.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/77750079973.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/74633341704.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/99127278519.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce2284d31---59506902847.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nk6leno8hkq6h0q30k715j7960/lifepogabemuwobuxajudapew.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8e731ba4---58216690795.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d0803471019---rekemapekemesaseza.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/9337628326.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/29929855455.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/023569fb88b7bad2d2f07ce0ef3dd5f8/timetuza.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a47823a373f---rutajipuwegajofamonij.pdfIn PDF document text
    • http://builderall.info/userfiles/file/noferefuzapalalevuxiwow.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/robajima.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d375dbc07---gijazoxagaxoludar.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9st32382l8nh5ui6tquppu73qn/panuli.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_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 18436 bytes
SHA-256: 67850748880b37a0010271bcb2fc02cf4166dbbe70c4c9ef3faed7b0f53cd8f0
font_01_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 11304 bytes
SHA-256: 04a46f2d0e8d8c4272bdfe36caa9a334c1a0b249f97cbeb7e52b6565991b3d6d
font_02_sfnt_off0001397c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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