Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a433bd47f67442e…

MALICIOUS

PDF

86.9 KB Created: 2021-09-19 13:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87ac711b40dc3341aafee4b1ed0f7f66 SHA-1: ec472a5d6ba1d2a912f9f904416fffe16d5076d7 SHA-256: 1a433bd47f67442e6046fac3784cef2233b47af1405b817010371259ca6f6fa5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to phishing pages or download further malware. The presence of external URIs and link farm heuristics strongly suggests a phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=moses+family+tree+to+jesus PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613842b2ec663---66716998771.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144db76227c5---60897979090.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/nafovatipibixunab.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/98650085136.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/rolifosudunokidubow.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-08-22-01-02-36.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/20499906267.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/8hvbhdbf7gs3gajucto9au8h2m/pujizojopuvamukojumepit.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/zulunipuromonabesawadew.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hbp3fokooqefspggiii5pj94ec/6912108860.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/rifovuxofemavezogaxez.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/55640586700.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/wefigelitefir.pdfIn PDF document text
    • http://gzwep.com/img/file/2021911202359.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/tezezaxafebavudobikif.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/fijugapavuditerusodeg.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/bakefofebawibosogu.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/digilununajivitu.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/gemumofiviketuzebuwane.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/godosimegilazupe.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_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 19144 bytes
SHA-256: bfa1e972ffbe1cc6bfbeb6fcf27010fa443722b8a5234fa1a7d2c9fa04027d9d
font_01_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 10608 bytes
SHA-256: 74c77e2484da15692fae3d85bef214b70d85a4d4460071b967d0ed9645ad8ac9
font_02_sfnt_off000136d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1