Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13e449fb62283b9…

MALICIOUS

PDF

85.1 KB Created: 2021-07-02 19:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a94278af987279732f9e85a856732b18 SHA-1: bcd0bcecd6c1b26ce007438f2c6ef8df54568782 SHA-256: f13e449fb62283b92c6fc958215f9905497c8eb9672e8a816fcb60ea237e06f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to websites that appear to be hosted on compromised CMS platforms, specifically WordPress. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c22991178198116c859970f5bca894f8/kejirasepalokijerexixu.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609827da58675---45327002195.pdf
    • http://amctop.com/board_data/editor_img/file/202106182020.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/mejoberulifavisebedatede.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7e323d09---97124720793.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda46a2b37b---54770504646.pdf
    • http://baraanduliaptti.org/userfiles/file/16852337998.pdf
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/tupaxanafuvideb.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/113bb412f777699ea77a0a3b360f2334/xigabugafajidotagofadaboz.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a72d5e6ff43---25080920704.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2c22e57b56e93c234223d7ad0480e2d6/liwavifuz.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ihlb4sdpbgpskb98b669qdk4ou/17569492724.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6e9a6a38b87331c4383c3bd6f7589d67/pizujaz.pdf
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/pegomujiwisawiwagoguxeki.pdf
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/fotifo.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609725890d937---57271295304.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/78452889112.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa02476174---galijubowewemuxonebuji.pdf
    • https://renault-service.com/userfiles/giranuzomigedevumuwik.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/2c9rtcqm0oal28b3hg3qr82ljh/nineludilirafire.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6e6a486b---mipoxabubonajulilixotubi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=and+still+i+rise+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe3.bin
890bc00ac147c77e865c1cb76d0411c9f9a608f59845063e3db38e1767227a97
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 10452 bytes
font_01_sfnt_off0001035a.bin
302ed05a40fa786e9a9b7e9378c35575c42e43ba8beb9e3ed025408a42617ed3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 16528 bytes
font_02_sfnt_off00012e19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 16792 bytes