Malicious PDF — malware analysis report

Static analysis result for SHA-256 7417d1e6d1e27b36…

MALICIOUS

PDF

90.1 KB Created: 2021-07-04 02:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e32b5943278cacab06e94e1dba0b5c5b SHA-1: 92dfb84e0e82c65adea1525685cc0888eff7bb59 SHA-256: 7417d1e6d1e27b36e096db6f7b22f47ac832a8dbe0e28967a51f6ca976718070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests the PDF's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://inwebjor.ru/uplcv?utm_term=area+formula+for+sector+of+a+circle PDF link annotation
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ov21nnbecb7nv5d1fquo7uvaih/kudopim.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/a583407cb09018e775dafd7c7ac926d0/13461512265.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6a7ecb24---53647819383.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f9d7cfca5---19938379638.pdfIn PDF document text
    • https://marosme.ro/hirek/file/beginepo.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/15288530926.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7747e74625f8f66c5ce2baf10a947490/simoxovivizisepope.pdfIn PDF document text
    • http://accronline.com/userfiles/file/13519645390.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608669e7d78d9---4167201947.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/pkiksf2232v84qa3pj2id86af4/difapokegaro.pdfIn PDF document text
    • https://eventaipei.com/upload/files/30787501224.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/rivudeto.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a42702446e5---dalezefawogakubireg.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ambkhlab9ch7f2ot1u6lf93f40/63141556840.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/38558760676.pdfIn PDF document text
    • http://mousike.it/img_ins/files/80015998866.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/926fdc2bd0d5c1456b6af73d9705fac0/30668425354.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/33122927900.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/20752799401.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/45159635628.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5d55c6d7495da6644fabc9b5e75888a1/xomadupapidipepotanodo.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/xisopibutelakavukobiwazos.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 18848 bytes
SHA-256: 836f75e814e6ddf3c40edbd4328edbd78a20e3620e46996d73f37d4bb3f2b37c
font_01_sfnt_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_03_sfnt_off000142ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AD 10472 bytes
SHA-256: 46839c6b0a07f1fa7b21824fb7f0778633c689d1ea8bea8198b8b28e7b49e33a

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