Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7f76b2b31bd8ee…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 17:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d32dd16ab8653498ea8cd46d87926d7 SHA-1: 2c5ffa5b8def947fac79f3c16aa5c090804a570c SHA-256: da7f76b2b31bd8ee8ff453d32f384ef62d98296161b0db309a22492f4f68c8c6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly supports its malicious nature. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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 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://pixomot.ru/uplcv?utm_term=beatitudes+according+to+pope+francis PDF link annotation
    • http://omonetach.pl/foto/ilustracje/file/39491838057.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/nenalawiluperari.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/13544220527.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c02a818a92c---78600172258.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e98f3ac257ad34939a2b73c4b0997bb9/rikitiwu.pdfIn PDF document text
    • http://belloverde.net/emailer/file/nevewekopesobemasulatevex.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/0l0eimfmrqqmokvg153q4ae2nm/ligezozutemamibepupuj.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/baxevazobubo.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/vatep.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/pekadumezujigavila.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/47617119688.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/popiramivep.pdfIn PDF document text
    • https://harom.ro/files/file/32903855957.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/cc6c7004ae0d09a48d64eb8a10417596/22494067556.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/52725212035.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/42gn8j13qglqetif9blqglnba4/zudimegiwo.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/7720813990.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/853012160.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc40ee3e7---67604768330.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/wilenejipuvufugivuruk.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/liraretevugivimejepoj.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/tewudotaribofokidok.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/kerigawesewujisekapaj.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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 18532 bytes
SHA-256: 4ac04f2916552200dd8bc1189f4d175cc9b07aa414f716c6ae1d750504da1598
font_01_sfnt_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 10900 bytes
SHA-256: 66922983b0c4a2d4ce3160f53514a56a30af812ae2003437a15accd7e6057df0
font_02_sfnt_off0001313d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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