Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4b1c94417cd4f9…

MALICIOUS

PDF

72.6 KB Created: 2021-09-29 10:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16d7402e3f86149bb272144c363b8bf2 SHA-1: 9c99662a7952079b85e0d13fe0238ba99a588a71 SHA-256: cf4b1c94417cd4f95611313d206591312f2f434433b36b861549b7518c2c7b32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting sites. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically mentioning 'san andreas mods for android', suggesting a lure for potentially unwanted software or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=san+andreas+mods+for+android PDF link annotation
    • https://yennenga.org/business_school/uploads/file/foxoboj.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/xazulagesopurut.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/1543048691.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/91952253358.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/wosixifujabaf.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/64489069702.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f56c6137dc---janoginifareda.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f9d72fb22b254754bb8aeffc4d055ba8/zuzufifego.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/ziwut.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/duvimifuxiwuxiji.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/23490763586.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/80846114983.pdfIn PDF document text
    • http://ombs.ru/uploads/files/40974693421.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/nitudorexexexatexos.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/kodebano.pdfIn PDF document text
    • http://gaudi.tw/upload/files/11862737816.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/23971482352.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/nepedatakipoxonebonaxona.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/zasedebizepusibilogaj.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/80588514153.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210927062812.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/bedesavavoziropu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/nhbt9v4jdvu3r0ja8vq2km8dbe/dixetijivasomororebafo.pdfIn PDF document text
    • http://julianina.de/upload/file/nupinafuraguxokipaku.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecb0625e39---birunovekebudexininufume.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_off0000b643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 10444 bytes
SHA-256: 5476c3492cb98e9ee2dc145426267fdfa1b2ac3f8ed537dca2eb7d596fee0960
font_02_sfnt_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 18388 bytes
SHA-256: b463868c884d3570d7580c8d26208046df8675858f84dbcc0eaf7073469c139d