Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c66412f4a9b58c4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 12:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca6bee33a66b3e58a8d09eeab59aabeb SHA-1: f5f3ad7e9e36e4fc8c99e0eeeda873ec9219e9f3 SHA-256: 4c66412f4a9b58c478056b3becd1d678899b61dae08b22269148f1d694229ced
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and potentially malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous URLs, some pointing to compromised CMS uploads and others on disposable hosting, indicates an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://kiddeefire.com/media/userfiles/files/27368075714.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139f656b4e45---rumanalikugulutadof.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/42348614841.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109030409263574.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210914095342.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135818ccd9df---74132200955.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/98456444831.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/medadekijokerepujubuna.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/tujeladutawi.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/77457252450.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/88546669269.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/valamasojuzupi.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/68291204888.pdfIn PDF document text
    • https://preciseenergygroup.com/media/87229920395.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/farodozubowaro.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/78036028315.pdfIn PDF document text
    • http://licausi.it/userfiles/files/lovinonaw.pdfIn PDF document text
    • http://sb-78.ru/files/file/togigexemizilejajulupep.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/bjuofc63m173p33pamnuc5ti5h/bipogumanoluxutofem.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/sadow.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/10768872144.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4f78f57c---sakasazonixojokafixuwenu.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/69738015071.pdfIn PDF document text
    • http://flirdining.com/uploads/files/26188667537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=most+rating+app+in+play+storePDF 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_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 18008 bytes
SHA-256: da7a462ff3aada85ec84f9c87ddc92238abce27c4eb5c9a8d64a8eaeea751f2b
font_01_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 10532 bytes
SHA-256: 9df750c07a5e5d8f2539ec8ccd829703d495b63c9c33e3054c01e3b5aa8da634
font_02_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1