Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c1f143d0b29a48…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 10:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3412cdcc55fcd6be1c0873dd1873cc21 SHA-1: d67b0c1594f024927eb752204afddf10a7e5cb81 SHA-256: b8c1f143d0b29a4885d95914b2e5a7fb2900d05727a8ca6f6516aa2eab2f0a4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, likely to trick users into downloading malware by offering fake software downloads. The presence of external URIs and a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://coretry.ru/uplcv?utm_term=powerpoint+excel+download+free PDF link annotation
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/dp2h5fmnrcsvl9v1imnq2aq574/jekewolojunovivapuburulo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077566452eba---44059118789.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/laragib.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608220e827ddb---zibufivulopujoderiseson.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a3a92a0d3c0767334c89d5a696558bdc/31343776749.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/kiligivilofodazuzezi.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/2837727107.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cf73cd087---gipuwuxuvoxi.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/57703183961.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608089baaa8b4---soxigetiz.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836fa81dfe2---foxuravinejuvekerexifosij.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79691dc51---raxaxasedasiz.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/81592328690.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f91ed333b---74762482203.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8dbcaf6e---lodizodazegezenatal.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/69030187139.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/65uuj3pvhf5jkbialq0ms3er5i/ruwomapumedebimuxaxi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d1d5e2a8f63b846c875c16ca5784917e/5613512445.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/musevirija.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/vekefobesowovop.pdfIn PDF document text
    • https://ivanamihic.com//files/44712578304.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f7529ba195f32f83e6b35fdd5515132d/vokowizuze.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7b1d10fbc01f079e05a202712199d5f2/bijijosazezivitefijadasum.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/22lhkppprj5fj0615usv28br8d/pasipizevetu.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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 10632 bytes
SHA-256: 8e6d62928196a15dd07a70ef614960b9199eb0e9cc7e4dfde3de35886ab22b5e
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 16956 bytes
SHA-256: 93df126854f4fb32a25f1d22e670f46e37c0cb27595878739d15fbaa2aad98ca
font_02_sfnt_off0001314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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