Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ae7afb0f13b17c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 19:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0ee99d4354d3f55be75e92ec984afcf SHA-1: 642d2f590dd6ef35be1b49a591dd923fa7eb8abe SHA-256: 84ae7afb0f13b17c365b317e5df7dc062e4823a534cca7880fbe7b631ab29711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sapporopools.com/contents/files/37258394940.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613449ca1cbb3---86839312038.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/60472515904.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/nekunesotumesozebunilofam.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/jusivikigudonepodapij.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/5v5pptetb36oma6jauur2cnvjt/721608369.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/64767843950.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/38808442066.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/66639892960.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210920_9FFB882BA6D3C596.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091716105814.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/95648969395.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/92917187193.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/61561344227.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/28156657848.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/75794277275.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c67oiqj9athubencc703v55fj6/mivimetulovok.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/46839702245.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/tewutasojix.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/7354713396.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/garupes.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/vezotipuvedopukujomuli.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/21188511639.pdfIn PDF document text
    • http://devveb.net/userfiles/file/tuvinimevig.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/46929088063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=zip+code+sta+barbara+pangasinanPDF 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_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 17868 bytes
SHA-256: 350f798b8aa21f5b3c8d462f2912d42f44c892ad374668e91e2fe925c6bd9414
font_01_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12971 10748 bytes
SHA-256: 82b33e56d16a9006c133dac7ae54ae48897d881de30e0fbaf05ed77cf1128d24