Malicious PDF — malware analysis report

Static analysis result for SHA-256 c910ce5ae236d661…

MALICIOUS

PDF

90.8 KB Created: 2021-08-03 15:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ea06d1c022921a05867708e8c5d120f SHA-1: 810922e115d5f02be27ce881410e1804eef4fcdc SHA-256: c910ce5ae236d6612fe17d3adcac605b1ba2c0a3e23bdeadec9a659f58b3f51f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and numerous external links. Several heuristics indicate these links point to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the download or execution of a malicious payload. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 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.
  • 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 http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac1eb68b3---66949403994.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0693d463a---40593061811.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/41668954172.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/vulunegededavavajusuv.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f55c3314---42110460880.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f2bf8988334---xirirunixanifapisufovufo.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/fufuxoxodok.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/59301596802.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/94093960648.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/58341434896.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/bajuratavorikig.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/109740c277fac7bf9facb857bb332a16/wozasusafijogategusi.pdfIn PDF document text
    • http://chayka-svg.ru/files/walelaferewi.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/sujavonokak.pdfIn PDF document text
    • http://clarasonic.com/upload/file/puvurovetom.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f24d91dab---52477596664.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b82025750---zotenupi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0n9o4ua88u72onndhj709kmjj7/51450781298.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/3038831130.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/per5soidr3jmdbg2nqdc8c79la/pitadabos.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a414c8a70f8---17790129272.pdfIn PDF document text
    • http://fullx.net/files/ragexarivozuvofezaweg.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/rabakudixudedaletofogo.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/37200004410.pdfIn PDF document text
    • https://petala.gr/userfiles/file/55982631476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ventajas+y+desventajas+de+las+redes+sociales+en+los+j%C3%B3venes+cristianosPDF 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_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 19540 bytes
SHA-256: 3e49dd0b65d10a7711e252958a21f5f4246a21322c148c3713ebc22095bab2d3
font_01_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EE 10780 bytes
SHA-256: 9f94a848285955cd73564f2a436506cc154a4bb819d79f2ed8a723fe58cf7cc0

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