Malicious PDF — malware analysis report

Static analysis result for SHA-256 49778b0e891ca0a5…

MALICIOUS

PDF

253.6 KB Created: 2021-07-01 11:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1d140bb0e86068e3cd34faad1f2d550e SHA-1: 1fddcf6811bb1853a1bb81573b7a47a654c74a4f SHA-256: 49778b0e891ca0a58d709be2c5ea8bcef58d8c4d18909ac82387f9a2bbb61521
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links, including one identified as an SEO redirector for free downloads. This link, along with others pointing to compromised CMS uploads, suggests an attempt to trick the user into downloading a secondary malicious PDF. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9692

Heuristics 8

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://nakatka.com/files/file/vapuzorag.pdf In PDF document text
    • http://ibtaker.ps/userfiles/file/sufexunakonebejofodonabi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3jbn2aisc913e1b1v0ot2t3f70/27758130775.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/44231774482.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/u26hlgnubb9niqrgjhjiub9et2/pokuwiritodavogaxi.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/zovorun.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/jiter.pdfIn PDF document text
    • https://combrooncom.com/contents//files/69000317544.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074d51c28293---xigotinegarufirusirudi.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/42241674502.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/192ce4fa844212eed22d65c973318bb2/gotobelipogegenulizo.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/tolavotejusovovup.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/guvugidunadeset.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/m14dn2mafiohf2p2hk142v6mh3/japebij.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4mvja1ejti1rlb860tv9d3bfic/risekabuzinedifadetuga.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/nolelasudeguweri.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc29c70aa7---pemexiwawuwotakigux.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/42389350845.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c91674452ff---3551376058.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/wovuj.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ec08a0dc---gakipe.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e4c144aa---25770015345.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ad497aee3cb---pekusaxibalazubid.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sunazasukorexuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=idiot+test+questions+gsnPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00036f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36F39 23108 bytes
SHA-256: ec366748b9636dd717f06c0650c3007c518915988c20db041a838a1d91b7fa44
font_01_sfnt_off0003a955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003c162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C162 4016 bytes
SHA-256: 83002adcfea078d37ec2fc3775ed3c34049b2e3a996a7a08d0406722af64ef1b
font_03_sfnt_off0003d0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D0D9 10312 bytes
SHA-256: b94300362ad648c6a1089275c628e1d2b6ca9645913e2b6c3721affe01a63f87

Open this report in the interactive analyzer, or submit your own file for analysis.