Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71ef3a0a2c4a0f3…

MALICIOUS

PDF

81.8 KB Created: 2021-06-19 07:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3ed77dd0422ca07f5d233da94098e47e SHA-1: e52f490f28863bc02935d2f3ea29f9cd3c05a05d SHA-256: b71ef3a0a2c4a0f34f794beb0bbed81f345ad8bad5846263da1a2f7c4696f1a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'strucid script 2020' in the document body, though obfuscated, hints at potential scripting activity, possibly for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

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 http://atthaya.com/file_media/file_image/file/dojidofexux.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/h27ea8qakqhjpusc14hq6fnvk1/sagusakigep.pdfIn PDF document text
    • http://primaneighbors.com/userimages/fulekelarabeja.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a27c7c819f---68185518046.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e357e65aa3---98372709133.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3aac0a0fb81adc19425c944034f95386/17366159313.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/nuxadafawadikibonepeg.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/5be6c0898528725c2a97c26ca9074a05/75224201840.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/d8c76493bb74094f76f1c4eb22501558/78684429428.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/purebupanujotimukagerewal.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2268c4b92---11494117032.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/5851358053.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/78415002111.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c16023cf82f47bb79666a8b757962d7a/lomikot.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd89869930f---getuzusiwumedogetesisax.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/39833728272.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/noburanumopasapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=strucid+script+2020PDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 5200 bytes
SHA-256: 8f692b7853c610c83613f9167af25a9c2ffc800e22a208d6d06484e2d75a7c28
font_01_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 11740 bytes
SHA-256: 7dff17db74119cf271fafb4d3e3a8863b7cadeb8314fe7efc88db2bb4973e3b8

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