Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfeb6d8a5afd6c4…

MALICIOUS

PDF

81.9 KB Created: 2021-08-03 02:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5da7b13b5437d8b202f0bd7e5ba42767 SHA-1: f27f083f4458d7d307febcfc5c3343cc018da8bc SHA-256: 6cfeb6d8a5afd6c4f430651b1d806095355eb10c98af4ba79020a94f07adbfee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. These links are likely intended to redirect the user to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=kamyab+jawan+program+application+form+online+apply
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b052e2f6b64798ba47eaa9a467ff8fce/2753901085.pdf
    • https://artenika.pl/fck/file/selazabezifedul.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e13f560b8---jevuzupukajivo.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/uqa59be0fa605mumuorl7i3j3j/86117639822.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160769ead199f4---puselofov.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9cbe46d77593fd9cfa8fb70103562305/75356182688.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8fa23a86---10025865750.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e4404657---35748609853.pdf
    • https://datatech-int.com/userfiles/file/wijusajali.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0dda88938b66d270641f037a1bc7018f/35898027031.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d75ec5df---zavakotivulosedixamotejej.pdf
    • http://rheinmotel.com/userfiles/file/24095433217.pdf
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/liwesilinimumilenevokep.pdf
    • https://beldapromosyon.com/calisma2/files/uploads/gokopulalinazago.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc72b3a96---31990111784.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0940f2c964---26624042449.pdf
    • https://notrepanierbio.ch/userfiles/file/lumikeseworukuridodeko.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/wuxexudewupabenaloj.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/nodowazabosajolurigokilud.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/18c75d636395e119fde11d28d440f2f6/sexejofanitedareko.pdf
    • https://cailux.lu/userfiles/files/pewowonijuvopoxifa.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/l4dgr9qak7fev1lcq8qjsiknfq/pudifigoxizenifekokazo.pdf
    • http://vetsnab32.ru/userfiles/file/vikejigejijetamav.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 16792 bytes
font_01_sfnt_off0000f560.bin
214c796b59a83f868a1c0607bdcee16365501855161fc223667f779ed7af5d7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 16500 bytes
font_02_sfnt_off00012047.bin
a3f46538a9f444be15f759a312b71afc7a0454e766074d748ade8c21a465f068
pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 11116 bytes