Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fc2f15ea996aee…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 21:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afd41f5f4c9eb62ca8cf1f41d3cad49f SHA-1: eef5628ab79902156dc8e4705735a22f47808cd2 SHA-256: e9fc2f15ea996aee3e141e126ca7664a5a8d64da44bf509c1796b7db8e6aa487
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports this, indicating a pattern of hosting malicious content on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=asphalt+8+airborne+all+cars+unlocked+save+file+for+android PDF link annotation
    • http://kleni.cz/userfiles/file/polafeweseweguleliva.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/19310604972.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/kuworimobexefax.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/tetaredunozitogugum.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16137df4073935---49001810884.pdfIn PDF document text
    • https://scalping.ir/data/files/file/38957924924.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/9808186367.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/risupinox.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466e5b810d3---46450208932.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/wudogudurekalibikuwuzozis.pdfIn PDF document text
    • http://thevale.us/userimages/18885344566.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/jinuranagujurunulafejipiz.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/83422586921.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/33060308006.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161392eb0bfe75---72084945766.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/sufatunisifajosodo.pdfIn PDF document text
    • http://sissonne.hu/editor_up/91576245439.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161307dbb38609---54516655601.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/rivawojikusonofekima.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/14702370400.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/11949970516.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/gefalaxawoporaron.pdfIn PDF document text
    • http://sdes.in/uploads/55586319863.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/74432814975.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/madumejejodelurev.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/8734426286.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_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 17744 bytes
SHA-256: 56d2d0d16c821f25c8d825ab9289fb89fee621f10561607bd7f1e7e0b650764b
font_02_sfnt_off00011a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 11304 bytes
SHA-256: 3804f334423231797977bf9cd71b2d796a77ddcd8787f7cb325ca0ef0f1e941f

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