Malicious PDF — malware analysis report

Static analysis result for SHA-256 4404e4a04995a281…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 02:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fccb2d3a2bf78bcf783e8875d3055a70 SHA-1: 081abf821e341237d12fe5ee9ac9acadd1c93e4e SHA-256: 4404e4a04995a2816c4161b6f6a3da13467d20d53cee8d046bc5c2a795e7e5ac
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the prevalence of suspicious URLs strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=callister+ciencia+e+ingenieria+de+los+materiales+pdf PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4bac56176---nunopilevigolupup.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424e34e75fe---piboxijefe.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9ba55d9c---63122149650.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/duzumupigogirevojezob.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/kopetalopilop.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/dejenekowokomupasasaz.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/87893691446.pdfIn PDF document text
    • http://one9five.com/userfiles/files/gaputezuxe.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/56648469108.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905084245.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/75750868886.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd67aae194---taxonefuvozuli.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b699e8af94b1ab6ab31afdefc7329b51/54613806191.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/35454414913.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/43970860885.pdfIn PDF document text
    • http://asja.ua/userfiles/file/wineruwuvafovomoba.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/75603153524.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/75977716751.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/12292818283.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/rezanalut.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/3048183340.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/94591637665.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_off0000be58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 10996 bytes
SHA-256: c984050036df23434a1964d4a640f34de296e3cc8b88a542a75e8302d8bc02c9
font_02_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 16712 bytes
SHA-256: 359be3876d785f88ff8adee508a40c419d43b67c9bea5f1ec1fb13d43b107a77

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