Malicious PDF — malware analysis report

Static analysis result for SHA-256 715e83ae82a8d18c…

MALICIOUS

PDF

117.5 KB Created: 2021-07-20 00:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 877b77f51d0b60d71621d26536275a4c SHA-1: b33f415d3c131d0cffc3524ae303c5cc5d659e77 SHA-256: 715e83ae82a8d18c3b680b9fefbde214eb10e4cd48235140ac4ca6ce5fb0b965
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farms on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://connect-senior.ch/uploades/userfiles/file/58325876271.pdf In PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/93606147678.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/56569390930.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb94ca898b---fasav.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/71r41n5cua7gc2vl71ningfg35/58567806060.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/43153ea6dd6fb9c9be27881275742c41/wasebedazug.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/12706312506.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3bf410b3---99078302317.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/27930251542.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/vemitukidani.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/bijogewonan.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd62c241952---76750483795.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c14c7bd4---32859888884.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/23d09f78c6ad557d1702b607c8316f1a/71951696854.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/61055521251.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098831fbd792---7915731818.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b49a16071260195d803c4d5d61b29921/81513869956.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96e8b1c95---31452640451.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4db5b0ed93763b05eb1875c1c451bc86/kenixitoforoju.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/68619027580.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607580551a53c---25276959425.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3fa546b93400619c74fce504f2c2143b/18146793800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=salmonella+group+d+septicemiaPDF 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_off00016680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16680 18588 bytes
SHA-256: 41a0207aded26e8cb260f5709b5aeb069624e89ebefe39b45fb3311f03c41225
font_01_sfnt_off00019753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19753 11032 bytes
SHA-256: 3ecaed7ac02043650f2219fe110563026ec753dfe0d04bd727284d94bbaf850c
font_02_sfnt_off0001b0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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