Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfc62fafe07aa70…

MALICIOUS

PDF

82.0 KB Created: 2021-05-25 06:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ac761af54c40e07705ed2c1dad990c1 SHA-1: 6a38f2735a9c75dc16b35f594788661a523e297b SHA-256: 8cfc62fafe07aa70dc811dad8d20c180951b7f45b2a0eaab1c6cc557affc5f91
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of compromise, likely leading to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f7dfd05a688806a5585758dabbd29620/jusinagepovunivusepidi.pdf
    • http://dichvuwebsites.com/media/ftp/file/26133723643.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160831fd766ee3---64821629226.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/v1psiri8bictjc09gk0r4no822/nimazexaxaka.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7b91a9300---9746207805.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/568t795eder7iv1c0ejh1f82or/tusoxatomas.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608631b3873fe---64190406710.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e4319113be82c8b06ea61ae8a6fcd72d/26013256799.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb87aab3a---talesojekarezodejavotes.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074788cde8ef---27400229690.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081821f6d445---zagejowivixumubekijad.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4b6763975ba3448f27a605e09d3398b1/39724933669.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90eba87b2---tofisinavasotaxinobaraga.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084731a512de---fuvibi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=is+broadchurch+season+3+good
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010389.bin
1a47ec9370e91bc7686bfd2aed3c27e633d358f5667c999de84ecce21e35cae6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 5408 bytes
font_01_sfnt_off000115e4.bin
7c472bf55b897a4a94fb6ba67d0b95cc33720eddf1662dbcdcecb73e1437fd80
pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 11280 bytes