Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c66da1a5e947c84…

MALICIOUS

PDF

94.9 KB Created: 2021-06-26 04:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6abac847c1447d9981c61a638720314a SHA-1: 17e511b091c528b0b13d4d9ba9c111fefb192269 SHA-256: 8c66da1a5e947c84bcedda21aa335054a1bd0ea72c456f9b298648441a4d83f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://ludifrance.fr/userfiles/file/ledepew.pdf In PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/8d4af88e26129e2c9fa9de604ec3936e/nabeseg.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/bukawabodamenugizemuka.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5430a363c3---19572923802.pdfIn PDF document text
    • https://loctra.net/userfiles/file/mobopawanofa.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f242caa5a---87863475911.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2b642e701---zuxefajijekopujesa.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/lujiwezuxozi.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/kopedorukabu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51375d706e---57889549717.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5d7a253d5d9183f06f920dfca0edccc8/24767610034.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/10c14138aca5065036fe7c9abe7c5f7f/kelajefakesipelegurub.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb0b26c0e---91994440961.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/11294502540.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/acab2fd9723c7c173294521f8162d82c/4752520250.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8f668d3f87c276e38da316ddc4b22eab/wenitogisiwavi.pdfIn PDF document text
    • http://armanetti.com/images/39655683320.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65094a3ca8---jilevewamufekejufala.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/82912417318.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/fobukijo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f2cd8444---tekijuwuzuxez.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090dabb8f644---68845373282.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/460ff2a15b1bfab3ab0e2c8f436f244b/watifitijatezuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=simile+for+experiencePDF 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_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BF 10392 bytes
SHA-256: 195d4fa560368081033fb21750e0d36c46b7407adf76dbe67b2cedfbfe1e4c45
font_02_sfnt_off00014129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14129 17680 bytes
SHA-256: 5988f413b65753b2fb3fddd4c32f054df2f69969f1c5848b7cc79e803ee90095

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