Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1c097eaa71c042…

MALICIOUS

PDF

100.2 KB Created: 2021-06-29 13:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d8248a3f49cc781ab0d0cc198c650b2c SHA-1: a1a449fc1703ea07b72508a9106db23936b20448 SHA-256: ff1c097eaa71c042f6d6c96cc993e11d7bdcdd4a03a410a458d0d775bf211e90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://smidgel.ru/uplcv?utm_term=lateral+flow+membrane PDF link annotation
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rh638piq3t8bmmjilo8i5hqds6/digixurifuwunum.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beded35fad6---buladerebofebe.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/zudasubotumebavibug.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/56987259390.pdfIn PDF document text
    • https://scalper.ir/data/files/file/kovemedokiketafo.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/nokofetejajabopuli.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/47422b11942386ac7a2495af02fb471e/dodabur.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e2a3a90a1---21703480607.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/rasinezowijufanawus.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/dab33c35b29ca58a6dcfc71446afda73/bubinijifaw.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/63350204335.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/mcnmet6tiomkj71or72vkj1jn9/nanotisiveture.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/30177680715.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/kipesevigopivozexosunu.pdfIn PDF document text
    • http://aps-mes.com/files/file/tatevul.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/16031202557.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pibolojivon.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/51234110890.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/biledosoronejexewetukupi.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/69c9b4003cd40e5590c2303604325595/rudifozolofonewagebedo.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea63c0fb4---nuvenemufaderasojofuza.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/lotpt40hf49tvsus9mt24qijht/duzemubozazewotemotexako.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d3d31b7998b77d1f19d09536f80618b3/79072802850.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/870bb6bf4a33470e309279a4e12763d4/nefemeputametaloram.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/9jjusp895220qu61fc7j6eph89/60884038073.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_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A52 18924 bytes
SHA-256: 34f5276c647bad3c77e6ff49197d3b3ced979c178291055cb86255ca24b17a34
font_02_sfnt_off00016c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C47 10300 bytes
SHA-256: b5335862c03574fe97bfc07610c115370324e1e2f913ba2576673dedbf33cc48

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