Malicious PDF — malware analysis report

Static analysis result for SHA-256 93095ac35d1ef9bf…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 03:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db00aee2b3b8846c2b0617b14b0fa045 SHA-1: 28e1e15474cb97976ce43dee19cd18006482fbe1 SHA-256: 93095ac35d1ef9bfc67e740167e53982d355cdb2013fad7cdaf7604501fa211b
204 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 a machine learning classifier. It contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which could be used for phishing or to deliver further malware. The presence of multiple links to compromised CMS upload storage suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://accesoriosalmayor.com/images/userfiles/file/ritobagezasukuzubizi.pdf In PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5709cc881---motatujerimawixopep.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/kodedefexuk.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/wimewuretiwesisa.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/92429322182.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/64927755076.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161072c8c6dd2a---35856936371.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/vibojulu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4baf058f99---rutofotozux.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/25348380500.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210906214557_ghk6so.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/29939937689.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/emgkirqedrl9p9pbon4thvobt0/sudakobinasilibaratitosup.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/17828392882.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/14117424482.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a122a5c7a---11795423924.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/m4qvvjufrvsap34m86m8g4i1ab/30252733949.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/doxukaka.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/74614124957.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d568d1d2---87378797827.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/94389341065.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608011d37f4bd---xunisa.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/79114378038.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5da16c35b---sabafonivasobisinobaloxov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=spandau+ballet+gold+sheet+music+pdfPDF 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_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 19260 bytes
SHA-256: 455b667345d56467e862c540f001d0fe37a9df03cb548acc6690e2619c235e3a
font_02_sfnt_off00012771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12771 11284 bytes
SHA-256: 73d9a6a0ae15483eda127ab359a27a99e7f26248e6eb14fc95c79326e5415f84

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