Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e7fdd7c41f29ce…

MALICIOUS

PDF

82.8 KB Created: 2021-07-04 05:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49894fdb078f060aca8749b707a5a517 SHA-1: 08fed8bef81af49fb30d102bac60e77afc6d8254 SHA-256: a8e7fdd7c41f29ce9543063d2c591d3bae0014dcd695553f86422f208517c947
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, which in turn host further PDF files. This suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the structure points towards a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/cdfb61cafb32c8ee5aca637d52545165/31674191947.pdf In PDF document text
    • https://micro-churches.net/uploads/file/gipakag.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/35a28b3c1daad940c65edba66d07e4be/51344878938.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/271lup5hv0pllft2ojhrbl1j20/xefizuzesibenisaz.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k2sn431vtu0hj3k1bd22me3si5/sazixibotawazetazakazif.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/11a15a041d9bc8a20c83c2027a04f9ca/nuvexiloperebabo.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/55405937730.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/15005327175.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef01c7b4c---lobopelonum.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210622_175231.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/20272244676.pdfIn PDF document text
    • http://hydrem.ru/images/file/kaxefudibofovivexikukuvil.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/susekov.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/69745714563.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/pabezubupiwunafe.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/35c998a7a953d5e5eefa070425ff7c3b/46238553541.pdfIn PDF document text
    • https://yellowstonewildlife.com/41195767221.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/tofovepidozexikulujef.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/poxevafa.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/5498219730.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/30571662421.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/7cf5e1c34e095b6adb5817989b37034a/68798839965.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aadaa1f41e5---24320342625.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a2502b8f1---22846393849.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/mojumadafenamurotewis.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb309c7889---99480421587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+routledge+history+of+literature+in+english+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 2156 bytes
SHA-256: b07637b55218b8250912a3c807579d9dabe8e102a586e736b8a09cad1b24f549
font_02_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10952 bytes
SHA-256: c12dba99bac44cfca77e68ade5857fa98e1784852b5f121a9f5108ee174cdc80
font_03_sfnt_off00010ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF7 17056 bytes
SHA-256: 527f15895562fbf817891d0ed38cd928d925494ba2c56479bdc2a99dc3ddb4fb

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