Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfd1d80c60a6ee4…

MALICIOUS

PDF

117.5 KB Created: 2021-06-13 23:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bb44ae089ae2470706f3900d20a2b3ab SHA-1: f7433dbc88d172c2b4eba0164db8281f25783303 SHA-256: ecfd1d80c60a6ee499d0d0f8fbaba64b9492f21f3aea07b3069f3e364be5257a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that form a link farm, pointing to compromised CMS upload directories and disposable hosting, likely intended to redirect users to malicious sites. The presence of these links and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://garglob.ru/uplcv?utm_term=dakaretai+otoko+in+english PDF link annotation
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/117e6f6c31ff3d670da759127b48005b/toxowuza.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b1eb8418---72454859997.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902c70c4fd8---titaxowuloboderezulomulov.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d962a023---wovizewixenozojo.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/wumewa.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/69756680356.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2bfe3e69a669e60e9fce36e2fe1dc508/kejopokuz.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086a25df2d05---ralebutuxajuz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/a4m86s5btmakrmttb95hb8tii2/62284055595.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4c272878dec469083582de49c30c8863/45554112901.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/72266743282.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/pojevatodamojexujetamak.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a40e0dc3065c4a6e86a8f1d006df5b93/sububuxexawoxejalive.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608b16724f125---kejuzepujagixobo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 44344 bytes
SHA-256: bc701da5b1271299823c694d67f08cd25179647d316f621448465ad4f375c412
font_01_sfnt_off0001814b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1814B 4796 bytes
SHA-256: c51113c0cdd1a1ffeb1c9182b9ddf86f36131e6ee78054e073c164d90798ad44
font_02_sfnt_off00019195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19195 12912 bytes
SHA-256: 22cd496c47fae0f460748f8d214f7a26a05b7391f76e0690a12f8babf1135408
font_03_sfnt_off0001baba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BABA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333