Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0fe93cb91538a5…

MALICIOUS

PDF

85.6 KB Created: 2021-08-10 00:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e0fd03a5941f135a6f9a794732747e2 SHA-1: 5c9409632942a158e58f35dbdf8beb1e87b39df0 SHA-256: 8f0fe93cb91538a530ee86ed989d147a5dbe41e9c701c561d37e598dbd81daa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. One URL, 'https://archism.ru/uplcv?utm_term=generate+valid+credit+card+number+for+testing', suggests a potential phishing lure related to credit card generation. The presence of these links indicates the document's primary function is to redirect users to external resources, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=generate+valid+credit+card+number+for+testing PDF link annotation
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9fs6m4ccd0ns4s0msvhiqmt7qt/43070644793.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e156c40320288d8c40af3f9ac45747ce/47018920225.pdfIn PDF document text
    • http://praguetransfer.com/files/file/1233177073.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/gulisobekuvepelezunedeb.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a973a69b049---92838838628.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/gaxowikogisibuvudugedevu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/371a883a7801df7c5ba8ba46f51ddef9/gerala.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a211989a6f3---pedizilerenudovoze.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e867c9b48---42283391750.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/dezotulipomi.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/dorebenozabukazupepupurim.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/48dfe93b334642b89a33f44d58b0c84d/33502728125.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1b34c3cf89274d3751f5625422362c60/tuvavejateniwuxasifobi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b73708148f1---97135319728.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094563e46103---minef.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/kilugmmoo1ek3ssc90nlnop8r3/vesomelanuj.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/vufuduvemifixexo.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210528152404.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/pepaxoxamotosa.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609615e330762---94949134632.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade05cc2d9f---gidiv.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a86bb6c0ae5---jafawizipofebi.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/52753086806.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe31e0513e---toleremomip.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_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 11164 bytes
SHA-256: 9b7670dd4d0393776c3d8f6c5ad7291b385d72ea5ee24aae7e7a5f8f437b3c91
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 17388 bytes
SHA-256: d019ec1b0ce99aa9a897d1fd5473596169ce03d60f562ee0a0f75c8d654133b8

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