Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95e1620d9a338e7…

MALICIOUS

PDF

91.2 KB Created: 2021-07-02 02:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9d5a0cb575adaf74844ac993e09fe904 SHA-1: 65db7be932e27dc1dd2acf3c72d0a3f86323426a SHA-256: a95e1620d9a338e737fefdf72cf87b4742678629f4320104d72e2cde752105bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eee28ec65---kezebawo.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877a692d0d9---93562883760.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/od6aujjn2efg07vu3meprugce1/towixiraganajojosu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/1df6ehrbtvq8cq0kgri1379es3/gifexu.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/79797593865.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/85891674558.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/gidajofosedorikeriwuz.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/81892360215.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/24614186764.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/gajav.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/peluwag.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9432d706---kopiviwobaliwufadami.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/suderifobadebajululuzakiz.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9974699121---83915669145.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t0advg3ovoqdp0f2icetocs962/jodujapefewefukelopi.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/ribivabubojuxitev.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5c4c5cfc9006d36b6bcad6904de17835/dixizumorafikezevatozix.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/jalasaxibodogilof.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8283c53b9d---79180259607.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da43f7a5920---bibututof.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/4c3e2abff83d237e12f6ed2d4eccedfd/xekapijekupinopuzalu.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/pefubasuza.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcbb2cb2c4---dowozizigexasevada.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160860008a175f---nodemorejaxixinin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=equine+cross+countryPDF 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_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 10360 bytes
SHA-256: 71ff434fd6d154765806e3b344ca3b39fbe49034b86325e56c2d0531fa0bb769
font_01_sfnt_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13343 17064 bytes
SHA-256: 4425ef5e9ca2f1524803682a68fb9f3c77e3f7069c9505b4a3b26f34e006c27d

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