Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc490ff051056f79…

MALICIOUS

PDF

90.3 KB Created: 2021-09-05 11:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 654dd1b5a8e30fd0162a3d4f417c02d8 SHA-1: 5283c4028b830ed27fe4e2f5873fa88c206adc09 SHA-256: dc490ff051056f79c8075f4d49bfba197a0f3f2b8476c3ed894af1f263fc8ecf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which appear to be compromised or disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://irlanc.ru/uplcv?utm_term=how+to+write+on+a+pdf+adobe+acrobat+reader+dc PDF link annotation
    • http://prodottoitalia.eu/userfiles/files/gebosajewabuzukeruvej.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/31182220605.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7edae2ea80dcad1fbaa4260d15e6e431/gurubesaxumefakituveduz.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/63138901318.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/gugiwagibamovir.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b59eea65a7c---vexazefoliwevadu.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/perutibomeroditetupituxe.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/pakidesevumufatoje.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/zobagulo.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/27116841415.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/34401246537.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070569adb6d2---gidusajudopejuno.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071835ddc443---68880650678.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/wibaluraxapo.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/sojeriza.pdfIn PDF document text
    • http://aroma--style.net/files/files/mujalizipirerakeroketas.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021080418011173499.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/wudomafej.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/vewunos.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e9c7b9c9---reboj.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/71657691787.pdfIn PDF document text
    • http://winso.tw/userfiles/file/68429254791.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/80999772603.pdfIn PDF document text
    • https://shidoremicrosys.com/media/61650772025.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_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 18380 bytes
SHA-256: 6338465ee8bbbbe5435e2417b70ace67d0871eca14d717a20162f307753dcf54
font_01_sfnt_off00012ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 10616 bytes
SHA-256: db0363c00c3069ed999079c95d52ce96d5c759eb6525d717c055c2c84e5f7429
font_02_sfnt_off000142db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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