Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5cc5d9b1fbe13f…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 23:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18d1d4fbc6f895dc18a31dd858ba9cd0 SHA-1: 2bd099e674cbf12d19a656a67a7d0d26f0b0a881 SHA-256: 1d5cc5d9b1fbe13f515b186c680b8afe8ee30da94aa9debbbe748565f4234f85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of phishing and malware. The document contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=september+current+affairs+pdf PDF link annotation
    • http://pcwenhua.com/uploadimg/file/16257036841603950758.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zakifokokon.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/81giq1gus0m0p2ho4nrar1bp2i/50174542318.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/mogobajupedoximug.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/27a9f2fac819471b6380b3d766acb726/lumexagoxofidizukefub.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a44e71738d1316fde6296f4415a3f341/kevar.pdfIn PDF document text
    • https://777mto.info/contents/files/2888632878.pdfIn PDF document text
    • https://hgb.se/filer/file/398696819.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/90029082971.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/12566529778.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161148845adb25---tipaxexalenikijulove.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607112a69ab2b---28100979457.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac248eeb58c---64810149851.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/80522680064.pdfIn PDF document text
    • http://babamoleskine.com/files/file/123622922.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/34296810292.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ed0801a71c8a8cbbca62af0534c26e22/71490086013.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210605_193140.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/wudevosol.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160945be3758d2---bupirosubosaxigin.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b6054a340---xefasigedewabedis.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7ebprftrddnum5di4cvunptrek/52314861009.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609079433a962---44330205226.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210824_31D18360C5D5B293.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/dec5112a4f80e0a3cdb1864618c732b8/91487192353.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_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 10928 bytes
SHA-256: ff76c6d327ca9570e33143c4d63bea9e3b1ffa5c92399bafc2cd2827f9da6f4b
font_01_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 18128 bytes
SHA-256: 8c39fa30f2dd9d3f60fd31c48445a2b13e9286fca656d35a1ec27eeaac51781e
font_02_sfnt_off000135cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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