Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5e4c8adb05cf11…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 20:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b6de50ba0cdcf909c5c8b8c957c4ac3 SHA-1: 3fee71ea636de507bac63ccdcf35296fe4ee8944 SHA-256: fb5e4c8adb05cf116ac83ec27954d46a5f23714916f55f455dae8e669fe0a9ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's purpose is to drive traffic to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • 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 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://annandale1963.com/clients/69704/File/33906959621.pdf In PDF document text
    • https://mclandpin.com/calisma2/files/uploads/ziketowixedufutefisima.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607444b973ad2---762319899.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/nisalajiluwutulumo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16106ccc333b02---68390350019.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/vobatunud.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb611b5a8bf---11368426257.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/73430076654.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/11110999442.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/vqheildjjv4r2sghv7qp8sisth/35203524515.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612b293eb1e0a---19524544646.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/lesuruxutalidad.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/90319233090.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612938c4a51fe---43557711256.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/56651049470.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/23a7e61efaf94b4d338880b716b86b4a/mivoxa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608643e391fed---12678634090.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/a2eba454e1d276edfde0aa3852077892/71539140864.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee21aa56a0---27716124853.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a9342305---78297032729.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/legivuxobojojisibuj.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088a640f2166---99039375825.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/94373150882.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/94b7130539f91f8681bc804653f916d3/ruwesotifutokodadukolod.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/kivapixuwugul.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/puzij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=highfalutin+words+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9ED 15732 bytes
SHA-256: 290222af5d8177efbe444410f6dfd5509c19600d8a14a3266c04b8b758014bbe
font_01_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 10824 bytes
SHA-256: ec3a33dbdf24941d5ee6eaebf1ebbdcd1c613dcd88f439375bdbd0958d627d6a
font_02_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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