Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5050c12b4428e5d…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 21:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 650d7ae1f0e266da7b25b01eee31986f SHA-1: 58e8ae2bb8ea07605aa6df0c7eb4662c6a334635 SHA-256: f5050c12b4428e5d26b88ef121589cde1bb99afa1c2afb548e3b4e0ca1835c83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9727ee0dd0ac998b0a359a280a94712a/sigisesilipuvetefewexu.pdf In PDF document text
    • https://ckmusicdesign.nluserfiles/file/fomazaxediriwubusomotowil.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b660a484150---vonimoboz.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021062305170149.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/p4oo47fbqh34ocd5udhgo29383/56884486836.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6e777c255---jomefanirega.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f04731122---delotuwijaruvuse.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01a922187---zezonuk.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/bqod7oqggqb5f4pavbddeomt45/49708493413.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21b461d19---jebuxipi.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210622221656.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d744b37b---modawetupejo.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/74653223583.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd36ce51cf---votovewoxavazizelofukixo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2a77a8316---86890445190.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2788f61165---jerosesonewijididokoroj.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/12613908342.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8364a0cab---67472652036.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210608_520DDFEEF42226AC.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/88933727481.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/95a06f55ab3b27074becd3c099ca63b3/fedabakofebodanopema.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160759819952a6---sidulupaxevawimixinopizir.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160750676c1735---letavurimo.pdfIn PDF document text
    • https://parfumzone.ro/files/file/jadogivugufi.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/tixopiwete.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/891ce24f87a602471b17cd4ca1967d4e/sivajezupofebujos.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/1af15620c3c8efc2cdbc72400142f14b/lofesajixomulakirovoxot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=unravel+sheet+music+easyPDF 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_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 17312 bytes
SHA-256: 03e0dfbd863de89b55d17d154dce13263201e500158bd72fc50bb8f82629e9c7
font_02_sfnt_off0001342d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342D 10660 bytes
SHA-256: b22f422e9ff29e98c9e05e3fa8a78291f32f44765b094abd0a2e71ff1947956c

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