Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58b65056994b39b…

MALICIOUS

PDF

89.8 KB Created: 2021-09-01 00:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: debd466cef3c4f6cfd26e62433874975 SHA-1: 81d142cb9e65355cb31b250ede3fe136d45ac7af SHA-256: a58b65056994b39bcec68b5795b86e74d79eca64c774fc38fd98046b5eb1fc88
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external links and the nature of the hosting point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://infrive.ru/uplcv?utm_term=pdf+refrigeration+and+air+conditioning+book PDF link annotation
    • http://ricarda-allegra.de/userfiles/file/roxamujawefowoged.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef84ef3c1---65682653769.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbe2956fd---jonenaz.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e47dc3781---18650304700.pdfIn PDF document text
    • http://fitviewer.de/files/file/niviruzipale.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/vaxumejelekajoziwe.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/9581167745.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/2061174507.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/61376490255.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b839e6b650f---jenudujara.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/35632654291.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/se86tmpd91nukd0rff0s2cgs8h/91948241624.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/22240313794.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/marusawatifoverek.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c82c558f9b---supatujilavivaxiwariz.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bcefb6d1b---56349146000.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf1ed55d8---jomimekem.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/78dfafe0128f228ed186ae2729c35a17/rodera.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/patijekutonawozawap.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/fofufutepugowimumog.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fixoxonepufadojomiket.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/84079653484.pdfIn PDF document text
    • http://vaynhanh365.net/contents/files/lebofufoxokenawawutov.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a12305eccd17dc2d185a3510de77d0d6/38149890436.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_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 17976 bytes
SHA-256: e38c2e6178202cea829ab76960ae40b7c69baeff449eb1bac9df4701e9e3157d
font_01_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 10672 bytes
SHA-256: 27e0f436a524cbca1f10c8514879379a324a37c08bb7c9e9c95340594f173404
font_02_sfnt_off00013ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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