Malicious PDF — malware analysis report

Static analysis result for SHA-256 61814c4672d46ea5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 03:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88c7ffba849f9d9bc780485f42a2b73c SHA-1: 13d6402f4fe0ce9b84f6982aaae8f261ed642aec SHA-256: 61814c4672d46ea50dc82ed66b4aa70ca4fe067e1d6bacdf908aadbd5c060c19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=maximum+ride+read+online+free PDF link annotation
    • https://ceccarmaramures.ro/userfiles/file/xozus.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/fepufunumaxomaposire.pdfIn PDF document text
    • http://partnercable.hu/files/951519226.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139858a3f910---miruvasa.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/gufunonoxinilukejemedufe.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/juronetotamobugoxokurefoz.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c65f80fd55426e027341c54836f0bd14/62979962993.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/57439130913.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/bijoxaxubaduzoniked.pdfIn PDF document text
    • http://jck.ro/userfiles/file/xapapusodufirakuri.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/6561250469.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/34724953124.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/31128866093.pdfIn PDF document text
    • http://partnercable.com/files/zobifepabisiwexejuguv.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/xilutenosolevekixazubik.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/luxililifutamobugalafel.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090812343473499.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/84877845380.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/setuwisatavudadoperozuti.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/27060910863.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7mevae3h8odb9t3gr17n322uvi/dunomerofizokodeja.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/97514761311.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/rigefixige.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_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 10444 bytes
SHA-256: 05640e5397fe93c936f0a3a702ad9b8a44f31ae90a15f216fcea74df5a212c0d
font_02_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 18116 bytes
SHA-256: fbd730c03b457c12ecc9acce16c5da7d401cccd2bb9db86ee74f52926ad5e331