Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf5272efeff3004…

MALICIOUS

PDF

82.7 KB Created: 2021-08-05 13:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: af67805dd5f9df7e73e7d1e6b95fc206 SHA-1: b3f7c8065ea8420a26a9af8fc5d63ada1f3c1cbf SHA-256: ebf5272efeff3004f8b11328d0b8db69ddf37f2785492e25d81910a847dd150d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac60131f5b---nemexapukelokutegapinu.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bca6b5b4a20---25260038855.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/70652395176.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/50999325557.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/zedixuxi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391be37757---lepipixox.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8b20394f---19514240042.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/26027189002.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608028bd61e52---49094191688.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a05832f19---kajovikekofivesoxixe.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b13b2c7bd30---69831507669.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/pupidetesowexoja.pdfIn PDF document text
    • http://schokobrunnen.com/idata/pigosukofaliwo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4912f086---79127528610.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0ae10a8b46d7f1b5fd29fc26d16cf76c/61154619386.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/21580163760.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/94562343236.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105110518056042874kcjxm.pdfIn PDF document text
    • https://tessuno.com/upload/files/60d7b3e2c8909.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/95c857c67ab7097db4eac3ce880c7dde/suzidiwegesetar.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/10286ee193ea3df8df2891937a5daf83/vekomijaxizabapixedi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b650ddefd24---50299341384.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce8a3b33f---49865034046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ikm+programmer+aptitude+test+answers+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_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 11024 bytes
SHA-256: 322010a7673eb1300fe2181b899cc508e019b04fcaecb82456f07804499e8da0
font_01_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 16656 bytes
SHA-256: 074a092db6227a37aae27642490942fdc13612fe8025c6fd65e37321bf18381d

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