Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e0292247a75f60…

MALICIOUS

PDF

82.9 KB Created: 2021-07-31 16:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ffc9c2ba312fed2c7ac57a3ef796bbab SHA-1: 52d662c3307677aacc56f2aeb0e0dfac7ecabab5 SHA-256: 19e0292247a75f605cebf825dcf3aa4e48561082ea4d5f901e238855d2e35e46
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking user-readable content, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://studioguagnoni.it/userfiles/files/viraniv.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a16285f664---66002681562.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/b7306j9qm0iufl9j5la5l7eek7/lulafuvew.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ac56d57a5---59555559427.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5827fa2c59e2f7ceffa58fda3764b4a1/wumemez.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fugipuxivulufoves.pdfIn PDF document text
    • https://yasacompany.com/upload/files/dipofulewarakilozaxuw.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f4157ec8385---gisogajixozu.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/dojivowivajivekorejameg.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/vawomez.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7661b11e3---janedewunobezojeje.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/4757330969.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/633f9ba13e680bfcb3284706d4638a2e/xonikewetejizafib.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/63fe9331a72bd853c908f91ceec55fd0/95685967383.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/ritonevafajiliwi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/45cef2830a3ba17843fbacbc1019967b/48194373179.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///53350777204.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/bidabajakomurodarete.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/52b62422b2e7f4a02a8e445461326b72/66200187939.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/nkk0f54ao1m36hoisi87hj9rsc/24163196194.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/xisepujemo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tozaxoloxelokoruji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=simple+present+and+present+continuous+exercises+pdf+with+answersPDF 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_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 11248 bytes
SHA-256: a15c1d0b10739c22a97fb9d6cdc7c9b7388e0329eb947f7ec821d5157a60f8c0
font_01_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 16924 bytes
SHA-256: 1cbfec07a8e0d497a3e6cf07fc4c46cab9372b12984d3bbbdd1395d00fb6d464

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