Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f651f95fdadc78b…

MALICIOUS

PDF

88.8 KB Created: 2021-09-19 17:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b853a55dd7db8c419ad3009b804d6b6a SHA-1: a2162c580117d0d7dc85413252eaa86867cc25fa SHA-256: 1f651f95fdadc78bf5878ffb28ee02351d60ae34ec2212319cc2e8315703a9c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, including one pointing to a compromised WordPress upload directory, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The presence of multiple external links suggests an attempt to redirect users to malicious sites for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://laborke.ru/uplcv?utm_term=fifty+shades+full+movie+download PDF link annotation
    • http://hwayoung.kr/upfile/files/44529355324.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/terumupofapobanibe.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/xerizinuk.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/sotedadorotazesowajer.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/39133269593.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/46189565978.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/kuwumunafibufijug.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/84867648182.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613eafbdd89cd.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/vinivepamejaro.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/74563458677.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/zelowofepivizo.pdfIn PDF document text
    • http://vina2002.com/uploads/files/gixesizeluvepukexisapus.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/ronafe.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///tokololesipojal.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/kotajemelojosal.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nibofu.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/33469795607.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/weronalutugu.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/47448540687.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf13065bd---91021270308.pdfIn PDF document text
    • https://actorconseil.com/files/file/vufaxuwijirowidigidufida.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/nanutera.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613851bab51e8---rutabubumobujetizukesakax.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/94d38cd1fb0a31d8cfb050d4fea5ca09/bapot.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/jatabes.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_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 10860 bytes
SHA-256: a04100b1f576c1ba7ecf60a8ab317666615c85b2d91bab781ca063fb78f81e2f
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B1 18720 bytes
SHA-256: de2b2de69695baef481b5c5f0254810413f77f8165127ae4e3cb6c8c3825a906

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