Malicious PDF — malware analysis report

Static analysis result for SHA-256 78141f9ca72dbb36…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 12:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d55da8d5f946080153f885569fd65589 SHA-1: 852de1f0094d3febd0cc4c197a763476dd510f93 SHA-256: 78141f9ca72dbb3619077986707eb1ae59ddb8ee56aaec43de122e38cb8ce472
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/261a45838bcc15b30a81a82d3614a100/fubedujimu.pdf In PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/18251392060.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202172204956.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/48060033020.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8a1650020---dulora.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/57784463799.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/59606014725.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/samurutin.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/20238147929.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/uerjr808mg0iot1de6hojoq1g2/fapolaza.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/gipekewilagoxo.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c7e7398b22dfc4f797ebacb0eddf2d74/76725173009.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/midarukunazeruxefuvido.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/32174518340.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a933105c---widamukujabaputamepibo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609857cbe2b11---53066880264.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210621154503_vgny95.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/019cbc0c2bc408227f1a0e7eb29cb491/guzikobemol.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1c7f75517---javugebapufavuwasufar.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/94987601338.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/limitulotuminapawuse.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c425f0fd08---revaxuvoveratazidafazi.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/zetixasedewatuneka.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ri8etrdhl8b11v4vv1ag9vt5m7/linanijuxeseligenoxinunum.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gigedumixebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=isolate+lab+nutritionPDF 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_off0000be93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE93 16260 bytes
SHA-256: 4eda82f2d240fceabeaada156df141cc4f0d53e8da61358e9ec433466ee2926f
font_01_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 10292 bytes
SHA-256: 561560c0baa21b9ff78daf4dbe750df85506aa56f93169551ce78b97fe5405d0
font_02_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1