Malicious PDF — malware analysis report

Static analysis result for SHA-256 332e3b030fc92478…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 12:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 740a438008474e905470c6628534617c SHA-1: ba2fe4d50a10158a2662cd2cfd1d3eeba4878112 SHA-256: 332e3b030fc924789c2000da6c8785a4cac89d59746b63e1ef17e38d34e244b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. Static analysis reveals the PDF functions as a link farm, with numerous embedded URLs pointing to external sites. Several of these URLs are hosted on compromised CMS platforms, suggesting a tactic to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://casadiriposomarsala.it/userfiles/files/muxoza.pdf In PDF document text
    • https://abzesolar.com/uploads/files/bowudaki.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/70803708647.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/jevisaj.pdfIn PDF document text
    • http://indel.sk/userfiles/file/damuvol.pdfIn PDF document text
    • https://shibbirs.com/media/files/11831523307.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ehaj86qjugsrbd9cg7u5h63vqb/48817807960.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/56003862344.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/duwajulumuzo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1b122201---80184514000.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c4e844b108e951988365822046e1d5e5/40062514348.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/gadosaronefonomafabo.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/44908500933.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/k8dffc6fs3jf6t3lnp7v2t3i43/498260268.pdfIn PDF document text
    • https://pecsikult.hu/files/file/5881346177.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vih0178g4mvsekfmqvj4a610hv/zujojokapupabarawit.pdfIn PDF document text
    • http://gazetavk.ru/img/file/84425123774.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074b93cd3812---88526619077.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608420e9273a5---bisusenatijejufalizu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16076d632ec676---leraxesiwawonog.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/fcac27fb0393d18e86b15f40941f6142/43755388051.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161119bcba7a6f---96591891587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=baumgarten+estetica+pdfPDF 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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10948 bytes
SHA-256: 561476c7a3aa32859f9c4deccd4dbe0440e466c61b7b66766ad79e5d4e135a57
font_02_sfnt_off000117b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 21588 bytes
SHA-256: c6bae1b86f0160e6c5475aae130fbfb0da9aacb2e2aadfec19d24929c9f70651