Malicious PDF — malware analysis report

Static analysis result for SHA-256 420e9d63fbcbc4f5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 09:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 350b4243cd64276b32bb9e04a630afaf SHA-1: 4f97b7fc2c53cf2fc2a4dc9aed76cd20aff1a5be SHA-256: 420e9d63fbcbc4f573628924858da0ed903a93e3186b3e7122f1a9508ed3b0c1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=portuguese+conquest+of+east+african+coast PDF link annotation
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c44fb213d2d---tukuloxar.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/61283789298.pdfIn PDF document text
    • https://signika.pl/Upload/file/79338000466.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5464940be0831fcb46f287b67478e228/dizusogefexokobofadaluwes.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/vemagogemoxevatawerakom.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/0m03841h1vlqt8uv316h0j996k/xasaranovijex.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607626a06edfc---gejidebos.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/31769875048.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/55ca438f8bbfa67c7c2d812052c5322d/rufalazitamibikateki.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/61449390042.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da08d8a96c8---75790526975.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/87408220963.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/gokepe.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/68694388193.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/9229334360.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/41395094462.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16126597ea0479---94548446309.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccab7b5fe2---58712024280.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/tisuruj.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/lonowotixirejov.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/47105612255.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5407820d859dc37be9a10802f76f77ba/75013201154.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/sekevujekinojebinosuxa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 17328 bytes
SHA-256: 29364abd88c754aaa841b2db3492cc68fd79ac61c1c5d546f197eab0b64cebe9
font_02_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 10712 bytes
SHA-256: 2acb6693e3235351941539439db4743da0a8ad4b760c21d84aba8a7c17ffb3dd

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