Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4915f28b16fba58…

MALICIOUS

PDF

89.2 KB Created: 2021-08-13 01:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 56ba0db1a1b15ec310e5abcf25d39032 SHA-1: 8636ad62aa1dac35437dd5c2fcc29529e08e34a2 SHA-256: f4915f28b16fba58214365bbfb18ee98f43b576e34fed166f42c4d3f2175fef7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, many of which point to compromised WordPress installations and IP addresses, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to exploiting PDF vulnerabilities to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/ca2291fb83a1d7dd037941c192c7a467/romufuvesirozotu.pdf In PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/90673168790.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16076bf3d1e826---xekusaritu.pdfPDF link annotation
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/pal92jnvn57r2jruhkf84uvlin/40796170290.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xowarep.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a172ae147bda2318cfcd5ef6d05cdda3/fefifibarofujuwizo.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/dogamolatesexazox.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/64831973199.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/82748711048.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/peviputigebesojexep.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/16186506c4cbd85938f6feee865450a3/46321072124.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d477c8ca4---55214476479.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/9205076913.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ej7dggporvim7omcv1bpnt924p/4171558510.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/41170598529.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/18734678711.pdfIn PDF document text
    • http://flirdining.com/uploads/files/zazufupudatiba.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/13858887636.pdfIn PDF document text
    • http://heureka-cz.eu/files/xerib.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/wagidiwava.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078bec4d9dbc---64536248054.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/zonifibiziwapubijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=aws+certified+solutions+architect+professional+exam+dumps+pdfPDF link annotation
    • 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_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 11152 bytes
SHA-256: 1bdf8acc075859f08c6e0473e3f0e10c054e6863fac014ddd530102b58f9f293
font_02_sfnt_off0001293d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 17384 bytes
SHA-256: 5e13c3c523b13c95f39918ecb31770c435714abd6ded21d331f4bd7ba029ea06