Malicious PDF — malware analysis report

Static analysis result for SHA-256 248f8b550f894cad…

MALICIOUS

PDF

94.7 KB Created: 2021-07-21 03:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a27311f4213f3425a12c8090b82bb6ed SHA-1: affb1d53e8ae25942239955ada4148558c32c481 SHA-256: 248f8b550f894cad08a8eadd323cd12bb1baa1bb49bcd5bdeb96e63b0ad320a2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to exploit vulnerabilities or trick users into visiting malicious domains, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/la09k12ldoojikfimnr0f33ed3/6714885774.pdf In PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe71833fff---96568090317.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4iptq8j3d6mvhak9ugimoaenm5/xenupubogemej.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/80346146452.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070208e1beca---34973912799.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///xobozidilijabuxofege.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9df8d2da9---92307098453.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/79205776004.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/dudogujiwam.pdfIn PDF document text
    • https://ayurmitra.com/files/file/lokabujetuxeba.pdfIn PDF document text
    • http://malifer.hu/upload/file/35307294466.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/bilemutijomu.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/6144739773.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/32184450338.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/sonakolixuwemuf.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/28878159321.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/wowawisugalikowira.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/gomopi.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/batifuvan.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/nizin.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8bmps3ts3nqdhgi3s9e88l6ued/mitufipi.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/wilibubetixaniduj.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/fuzututavuzajarojikesewa.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/36139680720.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/67610236772.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/loboxafukuwuv.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/27825034008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hot+mulled+ginPDF 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_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E9 10252 bytes
SHA-256: 3644b305c162bbf51a7eb5bbc1f702007fbc5d000a1c1c8d80e30fd488b672dc
font_02_sfnt_off00013d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D94 18316 bytes
SHA-256: f30cecd5c92b7a672b0b117aceb06ed374763f7303657f630d250b679f87c947

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