Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bb8a36547f3be6…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 09:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce7da6dd89454251bb36224d1604460d SHA-1: e55626afa492d14ea4399436cad733e62c1956f4 SHA-256: d8bb8a36547f3be60f3fcae9a63c78d78cdc53a7e79389c68867816f8f7c12cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or SEO poisoning attack. The presence of external URIs and link farm characteristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=tesla+model+3+manual+door+release PDF link annotation
    • http://beulahcooleycollection.com/clients/870349/File/gimisosuraludalatikeno.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a935ac379fb---kadizoberagimo.pdfIn PDF document text
    • https://langumeistras.lt/i/File/vogipidukilalofotiwanab.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/39117301620.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/fezepalazad.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/farumakajepenemaxiga.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/jeviv.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/vesofuwonuku.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d34a3041337b98e69362d4f49acafced/75928253232.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/67088244464.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d97c18c340---8619034906.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b38665566af52c2046e1974102bd54e2/79105051656.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/18b2700d00f62de2cfd228c1eb51773a/52039094705.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/edc95530fe62631af2fae436cc5e25a8/pibebib.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/kakikizekigobi.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/xejejazepesatavi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160944298791d4---jujudajogufojemifuwumolo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c12283e23cb---kutexiwenadapudepelijas.pdfIn PDF document text
    • http://edelstar-mos.ru/files/ladore.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f162659b0c2---dojexenab.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607508c5a01eb---jexosixokozaniweloredura.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/27528990447.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae85d4586d0---nipexopubatimovojogivaxiz.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_off0000c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 16972 bytes
SHA-256: 4fac0438f3e8f906bc6c3d479f7b419c3b358d81691088f983cb864e74c89c00
font_02_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 10456 bytes
SHA-256: b163263f34fb156b26f523ba9acb6c47fc68fe928c1ab7eb31f4b1ef2769b1a2

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