Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef93e80d85648bff…

MALICIOUS

PDF

79.6 KB Created: 2021-06-20 14:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a8762fa79500e3880a9a2bea7afb21a6 SHA-1: 0b66d110a46607f2d329ef5bdbbb5091eff25c27 SHA-256: ef93e80d85648bff0ecd28b52b67e93c8a4cdf4331a18740fb2eeafd66a66fe7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=wow+outlaw+rogue+roll+the+bones PDF link annotation
    • https://parokisantolukas.org/Uploads/userfiles/files/xenexuwidixawu.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/jobofalonaxuzepa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f521312a3f---xakegitimaro.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/lisakafojavomegajawisev.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/27df59432191c6077e95e705fba6b13d/kanumuruxijavi.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/jenomavosonororox.pdfIn PDF document text
    • http://hongdacable.com/d/files/80619880942.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075986334b01---tijasurawuj.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/fidefajuxeledazolazalozal.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/53debcc89c795c02bc58a19cf4391d70/buledife.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9d9547e3f8e5a3f431cd8daa03a24908/97353034904.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/60614664228.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160877a7747409---fiwifijeboxi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5d41d9b2b4282295505cbbfd7c10636e/lunojuzolule.pdfIn PDF document text
    • http://wjcopy.com/upload/files/56362057919.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb77e872e76---29189055293.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/femafadalowere.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 4112 bytes
SHA-256: 2a1a2ffa938b30a0e389fdfbac8fee03aa7d5923ea6da9e3709d7c76477cf42f
font_01_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 5192 bytes
SHA-256: 7a6d1f60cc739ee12e28b5c4e76473c4b3ac0bd05cbcb07a2c38a69162ab1cbd
font_02_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 12324 bytes
SHA-256: 943b10af9fe811c1b792f058446e0db764ae8e4f3e64bc73bb47d6d8578e024b