Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d8abd9225ef3c7…

MALICIOUS

PDF

70.3 KB Created: 2021-08-28 13:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 15e2121f1894f14b1c46ec0b88eb6ef3 SHA-1: 5b7187fc788041bc2272b54b09730634c6e82910 SHA-256: d7d8abd9225ef3c73c97f968a47b4c5264e493ddf0da62eafd2df0f68f262f78
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 0.9982

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://queure.ru/uplcv?utm_term=animal+crossing+solemn+painting PDF link annotation
    • http://faw-asia.com/image/upload/files/5553319395.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/goxeboboban.pdfIn PDF document text
    • http://schokofontaenen.de/idata/senogotavejefazudugitovuv.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/sapapetifasunijuvap.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf5ea04c2d---xekeluzebu.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/jizeniwutisijofojatavesug.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/cjf4565u0nfkcfrlqe1hfp7tiu/mawakujibazolawukaru.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/85621665946.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/pibepitoxodonu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3019c46495---15489447598.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af7ab7d22---56208804365.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e37bc5dca09---bawupiramipisa.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/38940446634af08bf56f2cb2f98b40bd/sufuzofusibug.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/mujab.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caeb789cae2---91078445194.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/lasala.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/50295529766.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/95881901692.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/br32s9s7lajt3jvce08hhfclri/geligexilufezufujo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7qjkd9euapep6bf9amgkias3v6/remir.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/dezelibosad.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3c72695230f8e2736a1016a27dc78082/jonizamepijeru.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_off0000b2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FE 10700 bytes
SHA-256: cdb51fd45ffe88e1354ea40370886997de620ac5e2778c3417933824dc6ba46e
font_01_sfnt_off0000cb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 15400 bytes
SHA-256: 7e50f974976919733efe39d5aa3ea77816ef47e899e913b52a27cee42edb8e91

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