Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5dc068abe98a8b…

MALICIOUS

PDF

84.0 KB Created: 2021-07-13 17:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43ee3751bb3974265024063b852b58de SHA-1: 40eae9e24ea5aa252a55d779119065a27f16d0ff SHA-256: ee5dc068abe98a8b7429432fc3ca47efaa3489f509b5d1c2d1780a7129bf32b9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URIs, many pointing to compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and numerous outbound links suggest a malicious intent to redirect users to potentially harmful content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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 https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8682c0dc772fc73baf19ead7627aff92/xoxekifaru.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/dexunifadutat.pdfIn PDF document text
    • http://e-hematologica.com/users//file/54977691423.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/uho3q83dtkg8lke3s1hhp16hvp/78709096041.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/mawoxuwafitipozuzefipas.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608accbb23fa7---zajetinufajujixaw.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/51100932318.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21a11149fc---80513046956.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b65abcd7a---sudonafojejukavodimexame.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7d6dd60d4eb6d50cd30554fdb72339aa/41180712388.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/supevedaloboga.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160899d3947173---xixifepe.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65ef03d7e---vafigekotizemizilosizopus.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/96721023534.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1624692412.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/0322dj1oi6qcpr9pergrtf3th0/37200228737.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d32f243e7---60680739671.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad301b0efe3---zolejejitizajaras.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/wifuvopagebemovekozamekal.pdfIn PDF document text
    • http://flexicourse.cz/res/file/nexujif.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/zuzabivuwejedukum.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16077e621ebd88---dokizupitajawedepukov.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608513032e082---9420580466.pdfIn PDF document text
    • https://bloc-immo.com/images/65005617635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=undertale+free+download+androidPDF 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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 10272 bytes
SHA-256: 6062b29f4c3bd8a5692c63e689dde2936a67a8478e3145805f7b603610eed72d
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 16516 bytes
SHA-256: c6ea9d6551e11c9cbeef169d89e89c796eada089d0adbfee6728136a0567c34f