Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad079407682c0c62…

MALICIOUS

PDF

87.0 KB Created: 2021-09-17 07:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d6ea73c3654c352c7c85918dcd6a8ed SHA-1: 6ec4e5b9750b7f1a22900ec974e163344025fe11 SHA-256: ad079407682c0c6247454f438b9634210289a235bfb7049949d185f92fa3d38c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, specifically using a 'free premium account' theme to entice users to click on embedded links. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://drafthe.ru/uplcv?utm_term=minecraft+free+premium+account PDF link annotation
    • http://es-manzokudou.com/yamituki-n/uploads/files/21978849762.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/77300669401.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/34332351236.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/xonizubuxobepababawaxi.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/83568526952.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/varerovufojuxew.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6bd044ae6---31693539145.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/kosuxifuregokuzuza.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ml35414o0c8mfqfq6pq3nd7ko2/95997140631.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/kuzetetagiwidonegewufem.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/konemesurovidabexejizum.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/42332848687.pdfIn PDF document text
    • http://precisao.org/files/files/zisuzowivifuguk.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/8085393408.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/dawuvolesuxemilobo.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/nixavijimeluvovur.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/kefasiradigareberejovewew.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6f12681f4a1c96544518d22f45049539/15311332972.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/86402953037.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/57745176297.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/papive.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/115da88a5ea316e8b24b42315c75e8af/bufusa.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/lobozafekoluge.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/45630066155.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e5ee7d6e4---zogizifuregub.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/80d568c35b2ed5a7a4c20d7833dcaa5b/girowefigiki.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_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 10520 bytes
SHA-256: 3300e3910f2721e33be2b3d2bda2bcc4cd337241a8d6f82d2ee0fa73d8719262
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 19500 bytes
SHA-256: 78cc6f1bc21772de30f6c70d0340e6f80e1dcea1edb4b03fc3fb6896e3f86c16

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