Malicious PDF — malware analysis report

Static analysis result for SHA-256 920c415146d045a4…

MALICIOUS

PDF

75.6 KB Created: 2021-09-05 09:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af86388daa1376e24294fb325b4e4481 SHA-1: 63c8bde24aeabd9525e5396740cd5d793a295a6d SHA-256: 920c415146d045a48c4db9c2dcc778c0a88f0c415e6bbe4da3692c6879a5dc83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://windmill-bv.com/userfiles/files/73530045134.pdf In PDF document text
    • https://najlepsze-w-polsce.pl/uploads/11317008245.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b65344f37---40669777693.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16082e965460fb---vaxusaw.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/48129446631.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124bf8135e3e---wugebinumajezujavepe.pdfIn PDF document text
    • http://firegallery.ru/img/upload/zujuvuxigewiputut.pdfIn PDF document text
    • https://foulardfotografando.it/file/14219277036.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/rowevetamanuvesepemu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078827f01fcf---jedagesasolojidisamil.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8a25ed348d26542e3055bd86d4b40b25/98318648202.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6d224115---lubunikanafabinidozeba.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c666118eb7---35358561645.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7781e3216---2610908888.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uf0psqe80h220a8qvsisvr03g2/10554336048.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0a3f914b20de2190d2ee32ca1308ea1f/57431192016.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/a28519d91b5096cc982e4c276820224a/62062831293.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/wepofoju.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f640190e21---tigeka.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/wutixe.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0b0110ff4f5bd291230240d33a5d1f55/nokipufekewoberufifiv.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/78714452905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fixture+design+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_off0000c38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 10524 bytes
SHA-256: dd2307e2ab478508c2b8acbf7c976d7b920cf7f89a3d67c2927e781c90c59c09
font_02_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 18212 bytes
SHA-256: 26d95e66fc70dc79f26509f3a6171c4218f18fe8b4e109b486320ddf7ed775bc

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