Malicious PDF — malware analysis report

Static analysis result for SHA-256 8194fc70cb5dc677…

MALICIOUS

PDF

82.3 KB Created: 2021-07-31 14:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e10f323ca9948622a2d4ed500ab33422 SHA-1: df1b63c093db7d8d8ad6b9c6385e0b851298c5f8 SHA-256: 8194fc70cb5dc677324bd7b69ce24589ef954bc8d818ef83233b325b96f82e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://synerhu.ru/uplcv?utm_term=types+of+conflict+worksheet+1+answer+key PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dad2656253d---zomutusawelasedo.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/34218743775.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd0309a4fa---16229043461.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68fe1d0fe---wifonomedefiwukinofopas.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/jaxozud.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e32ce72c9---gaxelasexesemuf.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/supowafogalimi.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/belipebafakumasowixusu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608725b1846ea---33137981989.pdfIn PDF document text
    • http://clingac.es/d/files/42509597520.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/nixixawakowowuwuziluva.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/vijoditapokinir.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74d193677---82547083276.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pk2c9qic8ob1vee6cavkrdk9qb/tibigabimotorowid.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ff331ee7b9f3a4319524cd3c1c36aa3b/dixisiguta.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3dab66ba9ff4a6f00ec03536144053ce/mamixurisixatuneloposaw.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/fimikeditevopobefuwoko.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/simur.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/37054371011.pdfIn PDF document text
    • http://abroadster.com/files/fugolep.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/pawekekagizazituxewivag.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/2973544534.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/kc3o52dp6jl0d53tf5qdmcfut1/23152458597.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/dovenujogilesi.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_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 10884 bytes
SHA-256: 36ea7f1de08f1dced6fbbab54ba704a2c174b48195932168758be21c57a55fe7
font_01_sfnt_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 17700 bytes
SHA-256: 5947425b5951fa200c36ad038204f34c26a5e872f27b16356f64aba7b5d191e4
font_02_sfnt_off00012277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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