Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2e5e515ba14e07…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 04:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a19b5fa56d488391792a3461435fc1f2 SHA-1: 1e929a3bb7e9ddcc4763bfedcb2cb0994a2ccfd7 SHA-256: fc2e5e515ba14e071033c783c2f45e8c36e273809e84661ffa51726742262aa6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the high number of external links, many pointing to compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=amaze+file+manager+apk PDF link annotation
    • http://rintoyo.com/userfiles/file/vazosoku.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a3gcakfv9u6nqrale3g2127iqu/benipir.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486f81e6302---10531922735.pdfIn PDF document text
    • https://medius.sk/userfiles/file/37365647358.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/kusavatolugajasukonunu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386c0ecd97f---pepepepuxaxabofakum.pdfIn PDF document text
    • https://binhvi.com/upload/files/pugetinukisepuzabagowo.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/99694123387.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/54087888226.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/26219308259.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/90422371820.pdfIn PDF document text
    • http://azizolace.cz/images/file/xapufobemudamivabanu.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/94895245998.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/24297383146.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/98600154843.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/84947612011.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/84179877464.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/desubilejuro.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/baxijojafikujulekek.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/sukapajurig.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/83961175637.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_off0000d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 10448 bytes
SHA-256: bda062885ce51da36e1f0ae9cb9e28b02d3e4eac1a7e18d9c113ad7ef5d26233
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 17540 bytes
SHA-256: 831d364c6b59b009db66298f64855ed814e72bbbc8427cc6209f705913dea4fa
font_02_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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