Malicious PDF — malware analysis report

Static analysis result for SHA-256 121d79662ebb6fca…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 22:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f431e9a1eb7f7beb7e8c00cc585883a2 SHA-1: 7f4c838a490f52c5d5c7348a5e1e7e3b6b52dd60 SHA-256: 121d79662ebb6fca41b5afa17e0e207e877cec33a2ac5d965bbbb021a020c87d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=manual+labor+meaning+in+urdu PDF link annotation
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074884eca6a4---37264861719.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b05224bbbca---45459397044.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210708132451.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/mifenexafod.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/676cf59716c6079ac5e0ad44055b0a1e/53468380534.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/60738623511.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/lojinewarorukipuxifu.pdfIn PDF document text
    • http://pk.mo/userfiles/file/tevediwatofomemegu.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/43915632797.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a313ee63f---35731849286.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/89211795106.pdfIn PDF document text
    • http://chikatere.com/Upload/files/19851297410.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/991d2f2351f61f8a6e162092eeeb17c5/2945934363.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wutadujitekazukiliw.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/rozojunaru.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/345578464.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8e21923303028592ab7bb3ad0d5e7054/27636245071.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021082009485314.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bab229be954---rozetarobasuzolututenafaw.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/e5ba41a8fab83ee27fb9e86749814544/bitowigakonetumegasewaje.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c069af0d217---nelevafawuwabelogubej.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6517aea90---83343800847.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/88079531215.pdfIn PDF document text
    • 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_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 10556 bytes
SHA-256: aa535b416e0e68213e90c52a3b134ed1d968ad17048e670a4d5502c7ae1c9bf1
font_02_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 16264 bytes
SHA-256: 3ed09382a6b5023966e6f8c1c5045e32f1e530e3ebe1ff2425fd988ece1bae7a