Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08a537b727ee052…

MALICIOUS

PDF

100.8 KB Created: 2021-07-07 23:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 936490fea8e186183f8e1c4b71611a93 SHA-1: fd626d7681f9452b490156712ebf616cfb5f5ce5 SHA-256: b08a537b727ee052ae0f93133fb69ea1c8d21b00d838595b0abcd6691f49fd4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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 http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799452a1bd6---65662582967.pdf In PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ffb40343e---javuwagup.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b42c8f10409dd656ac48ce226fad7702/jawagumed.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7392aecb31---nanatopas.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8702c40014adc4a32de1044e40cf7112/jelirukazojopetob.pdfIn PDF document text
    • http://canvangdientu.com/images/file/27247529414.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210704234622.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/vukefebolukuna.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607084a5e1e90---24950545879.pdfIn PDF document text
    • https://austarpharma.com/upload/files/pibadugo.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/11246504857.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fed4a1aa6---93216776656.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/kegamo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d92ce0873---wapila.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/046e77ebabaa4d71ca5df56c05932a51/jutizanuzavivosowumav.pdfIn PDF document text
    • http://carszana.com/image/upload/File/84559174422.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/27243841229.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/magovojanejexapane.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/0kmfct258pvf61v7e5bnrvt8be/94250717383.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/sisixigijanujulivuzunu.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a84641641---22379262430.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/19490663593.pdfIn PDF document text
    • http://ahchala.com/img/file/57698843708.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fe2c70a882583f7e958686670f8e2a78/liwonesoxugili.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/zamazuvirux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=stochastic+processes+ross+solutions+manual+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 17232 bytes
SHA-256: 588d062e906ef3f066e8a0cd37109aa322f4321773c415992a6f9c4f14b49859
font_01_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 22120 bytes
SHA-256: 792e9ae29898bdef2b5c1437a2fadf475d0429cc8511f26415175c512afa1e99
font_02_sfnt_off00015038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15038 11060 bytes
SHA-256: c2ffa9f3103e0fe86fb952896871b1ab5cedd8a9d28bd9698ea8330bc99e8cc6
font_03_sfnt_off000169c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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