Malicious PDF — malware analysis report

Static analysis result for SHA-256 efabf08e6d8af604…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 07:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12e841577f4e6e53e3b1527faaaa3099 SHA-1: a5fe11e55f685ba69a759e0e8b7c1cccebc95ec0 SHA-256: efabf08e6d8af604a04be4da24cf9ce8d8fdb8874ffbaec5ef16c9f6a52cc65b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c7bbb60d---sopoja.pdf In PDF document text
    • https://sjalikave.hu/pictures/file/12827496839.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/67705278150.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/xilipofiwalososez.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a988f62a3c---pikelu.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/cb64d091b367bfdd3e5872e990666188/fexaximavobiluzujana.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081ab9baa146---kobeli.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ft5to0orcl6aahomg8vh2363jo/ganulijatorumixavuve.pdfIn PDF document text
    • http://18554080.com/userfiles/file/xevubizazekovabij.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3336da8bf---22153786061.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620336364.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0203c718e---jumeb.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/derazixipazewa.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0bb0eb76d---mamikevobife.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073917254a33---16417721530.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/nomawedozogomunevufun.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/609955eafc2f755ba6ec67c3d6ef8243/julomonukep.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67c08ae5f---98928957297.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/mafosasigep.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/86ea193fba7c551a87a49ec7dba61acf/ranopizi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af38937e854---dugogavirijetunaselezisi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5547b6f879---52236147587.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/69685105159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ratchasan+movie+in+tamil+downloadPDF 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_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 10732 bytes
SHA-256: 42525780a678a740fa088d3b32f3639cafc278e89e7f2df53b5d0cdb68e33322
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 17180 bytes
SHA-256: 8ef0bf21bacb0c76e43a294add2f39967a92bf6353942324afc092a093c06757
font_02_sfnt_off00013d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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