Malicious PDF — malware analysis report

Static analysis result for SHA-256 e410de8e43a430f9…

MALICIOUS

PDF

102.6 KB Created: 2021-09-03 14:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d87409b09ef1ffc00e53cc6919f7f678 SHA-1: 6f846c749f96d141f018c6f02cf148fb7bb45283 SHA-256: e410de8e43a430f9edd69f03c73c9f1909777b24e05e214d08b67f9bba6751bf
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links to potentially compromised upload directories suggests an attempt to distribute malicious content or manipulate search engine results. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/35ncqvr2i2fhc9rejsi1jsr2nr/denejulo.pdf In PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1e98d060---zivamafipawomufupuwurup.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/garug.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108150907332802.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/5042022799.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5794b937d---kutupovisomipan.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/96881463426.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/83087263122.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/weditisorotosubaba.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9763b742076b5ec20a209cd220d29a9d/28529865062.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a6217f99c14922776c3446fba7dfc85b/zesigirazekixapijixi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ep5huttopuqsg8r1tmkqdqeuh2/84389795089.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/58560905530.pdfIn PDF document text
    • http://turatabor.hu/media/94169315901.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/43825293786.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/govosuzumofesibopapuxin.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/5678621acf7606479b2d40b3e47f518d/29400660883.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a145db5df90---kosibufuliwosaguxomopu.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/fukaxosifavogetogi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lm6vg41etu48b0c27m7e71rgh2/nanejigedadugesanumuwe.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37884e3c1---xodutozegewi.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/vosamubanerigekavod.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/xegekejerogelip.pdfIn PDF document text
    • http://honda-vo.com/upload/file/pojofalaxotosegositifut.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ae3dd7fc98435144db19958f1204beb3/9623409762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=poweredge+t140+manualPDF 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_off00012dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DE 17860 bytes
SHA-256: 1df1b0795d4c6f14d064199b59c373ca1935e600c44961a0f2c3cefa4fd93631
font_02_sfnt_off000173d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D2 10772 bytes
SHA-256: ef732d7a11bbdfc078403e36af3fe125b8ed3c3b75fa5281d061b1acc851b0bc