Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d78e6d1f26eeb59…

MALICIOUS

PDF

74.1 KB Created: 2021-08-09 07:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51768cac1e2e01c52c7a3823d9337a1c SHA-1: 00995ac45a57820af0c8484a7a3ed168f840bf5a SHA-256: 8d78e6d1f26eeb5968c63e022d70141bac7af27ccbb085c6d4332556854d2b01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via external resources.

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 http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738a68616c3---gobanugixenimisige.pdf In PDF document text
    • http://montrealpsychologist.org/clients/c/c9/c9c46cd79ea88ac5ae94f64bb0de8c36/File/womol.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/l82n75186gibg6leip30qho6oo/99536019867.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/tudanodatufidirupawuvesep.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3df63c406---69923379741.pdfIn PDF document text
    • https://abeess.com/userfiles/file/97393878802.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/gudeganopedetewozufe.pdfIn PDF document text
    • http://vejwun.cz/images/60691109908.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/79338771985.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/77764352323.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/95821645428.pdfIn PDF document text
    • http://vanhacollection.com/images/files/kipamedim.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/97317220311.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/visilifaniverunomokekiw.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/mumudi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1e7267278b141e8679d1bc4ab053a2dd/zupufero.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0leoje5g89fnu480ghaj4oif9j/wififoxalita.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/janisunidofude.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/suzipefefetukipajo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a6badbcb7---48395230353.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lulib.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/rorodevivorutobipuxe.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/desikipelokarubasas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=american+anthem+us+history+textbook+pdfPDF 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_off0000be85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE85 16008 bytes
SHA-256: 77ba39a412a06dc779deab2054cabd745eec237bcfbc87db13af6a29b992fd4f
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 11368 bytes
SHA-256: dc4c3679c22d0fad4a814bc0b5fb68c4c1189c8acaded06d5af09f22270a1167
font_02_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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