Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6be261fa8842a43…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 21:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a524b88633b848b684234a9c71d2fba4 SHA-1: 6eb3b84cfc76549e9374f2f81085f5fe91f97390 SHA-256: e6be261fa8842a43b15a7fe786c22c3a475091e3d74c8a811decd8ec91f8b7d1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of links, likely to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://hongshengfish.com/uploadfiles/20210625/210625110544503201lyffyohpbk5g.pdf In PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/tadatavebevikewakoniwewa.pdfIn PDF document text
    • http://lovesenergy.com/file/nakunawuxi.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/juwerixa.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/15568727362.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6417180c9---tusoweletej.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb8a85f7e---fuputukojizalapoxajexonen.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/36469729573.pdfIn PDF document text
    • http://hotechike.com/files/files/gokefedinomuzuratesataja.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/66050123400.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/23/file/fovifazo.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/77083839145.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/ponusebodegawalix.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/texogixiziguzo.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/dajemovi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44398f090a---71830683182.pdfIn PDF document text
    • https://jagominum.com/contents/files/wukexilego.pdfIn PDF document text
    • http://ciskmv.com/css/file/womisoxititikomejater.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16229789391121883005.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/mawibudimakimidavud.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pusubeninapudesubula.pdfIn PDF document text
    • http://video-cycling.de/files/file/44432620944.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/551ef39775933744a075156a3167eb10/bowedivanirel.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/50089226350.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9e0b4fd9c9739f29a5446eaac804f176/fiwubigex.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/fobezonuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=xrd+pdf+database+freePDF 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_off0000bfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA2 10276 bytes
SHA-256: 8fae109a77bf6dcb3785b683f887931a6cd258e554885c5cdef16475b9372733
font_01_sfnt_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 15888 bytes
SHA-256: 96d15d0f7460850b2c7bb3757292a8b5c8ddffc5474b9cd1c50527bab75a2b47

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