Malicious PDF — malware analysis report

Static analysis result for SHA-256 227a145b8db3955a…

MALICIOUS

PDF

96.3 KB Created: 2021-09-20 07:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e6174477857e9f82b86d3bdda629903 SHA-1: 7ea7c1bb8e4f04cd6feb0d49f9610ddc9d396aed SHA-256: 227a145b8db3955a40c5522c2f6997514604a87729b4ca97d77d7a6c4f697939
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=the+outsider+pdf PDF link annotation
    • https://amigo-shop.105h.net/upload/files/59639029111.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/minube.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/pikosatisajojojogagi.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/xopew.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/lemuwedisikibinuwisuwagib.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dqg0rk7r81usm8b9u3780s21l3/fajakevisopukumel.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/75378440634.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/71050858787.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pa3k2575l829m44v192ar7bnb5/lowavaxazubidojobibiw.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/38678492633.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/29425680513.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/25555080780.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///neduwibomitoj.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/9813649604.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a326f47228---luwoja.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/54701618444.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/6707595639.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/vefagidilemeni.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/26133516229.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/23165083905.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/50061090101.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/66784701355.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_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 18708 bytes
SHA-256: f0ba5ab1976112d976932b991ef8a1ff905c6a527f981ec4ea4918a4157fe181
font_01_sfnt_off0001442c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C43 10348 bytes
SHA-256: c9b8446070a574f38b917f5266b50ce6c809c40c9e64aef9008c9a2977897461

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