Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5017f9f214119a…

MALICIOUS

PDF

87.5 KB Created: 2021-07-02 03:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4f0eb13e11d9c26c1c00f07319185b58 SHA-1: c971ee5ff2ede712478970581b76f14dd53fc2fb SHA-256: 0a5017f9f214119a503d2d4a94e165dd2f30a2107516a7333c252f16335d71d2
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were extracted, the presence of multiple external URIs and the high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://apexnepaltravel.com/userfiles/file/79509516936.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/05b5df7b90d21892fd36cd14e0a0070c/xorufufonupojajetu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a913bbd4d12---61071028516.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/komaviguwajokukulatinib.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/nedobowotuwazavebudiba.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/dt0pvo6ij9243k9gbq6ujs1au6/tusususokobadebofibokowux.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/foxukemezaxusuz.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/taj8sa4sg9jv5rmpq8kqnkp3fq/naparoxilawufitulemuzaju.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/ralaluvarotajovemusikuja.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r04sjcu01dm1dl0bfqpdnn8v44/93416593260.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/54998019024.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/minakanupar.pdfIn PDF document text
    • http://kme-kme.cz/files/file/totimel.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ab2b38ed8d---fabonozek.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a88480313ed---mivexatu.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/vutuvadajubop.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9072ae9d---46733053226.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/mopawi.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/174093587160c9a5ba83850.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086e75634ae5---34047568797.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/77572875658.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce61cefc0f---nunujawukutobo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gnp1a9utq04teil35svcl8pl36/36049272629.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a172682c0---zowijegas.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/56717530982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=petty+cash+format+in+excel+sheetPDF link annotation
    • 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_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 10820 bytes
SHA-256: bcf794ffff6807facb56cc9d38b39bc78c8e2d8e60366c25e4732bbc031f3300
font_01_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 16880 bytes
SHA-256: 7bafb4db5790df4d4132c7250eb0392e2b50ed9a453fcdf131e478f29d0b79e1
font_02_sfnt_off0001389c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1