Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bd21dbf120b40d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 14:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1815afbc5828590798bdb6c637030a4d SHA-1: 9866615e43855a3290b2fca2fe9ac330c52b2fce SHA-256: 68bd21dbf120b40dd47feddbfc93da9e73582cd2243ae542f9f64aa21a85e1b6
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious behavior through multiple heuristic firings indicating it is a link farm hosted on compromised or disposable domains, designed to lure users into downloading further malicious content. The presence of a 'Password-protected archive lure' heuristic suggests the document's primary purpose is to trick users into believing they need to decrypt or access an archive, likely containing a secondary payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=how+do+you+turn+off+safe+mode+on+your+android+phone PDF link annotation
    • http://fulns.com/uploadfile/fckedit/file/1631953082cDKa.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/wabodopunekuzofomi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e7db89aa77d23e95b16d3bc63c1f1714/37886746860.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/11c7f76578453de87d1d816e8ff716ab/65155872756.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/rajozi.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/79615613036.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/56110592799.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60442303533.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/38161878355.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/tajelajeravujiroxu.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/30566272719.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/zojupovewu.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/nudisurosusekelemavu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/30f332d5ae52dcfec4c5d243e47b2bf6/zeboragagokeman.pdfIn PDF document text
    • http://pronobile.de/catalog/file/66465402234.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/sufig.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/54972208488.pdfIn PDF document text
    • https://el-tall.pl/pics/file/56867659826.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/76807049157.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/86302928015.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/63236992917.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/7111230690.pdfIn PDF document text
    • https://citronel.com/userfiles/files/narapemeterife.pdfIn PDF document text
    • 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_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 17844 bytes
SHA-256: c66cbbcff9fce8dc0e3fc3733324ac7d281de6ff42dcca87d9395a4c29ac0a2c
font_02_sfnt_off00011e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E85 11008 bytes
SHA-256: fe3fab7e92de63e9867b15b4192756fa73992bea4295a6b1b97931cd2e043b37

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