Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1810b1905b34ae3…

MALICIOUS

PDF

100.8 KB Created: 2021-09-20 07:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 470493fd8cc8cb4e40aaa240b7b1444c SHA-1: 5716dbf35dbbadedd851a10857cfa22b14ca68f3 SHA-256: f1810b1905b34ae36cafd6ab00c09efea1a93b9694f37eecdc2546346db0b097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely involving the exploitation of PDF viewers to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=screen+cast+android+10 PDF link annotation
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tqobll1cr9nsu47j845ffs77m3/72479720827.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/81573366665.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/72592564575.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/liwesixokarazoje.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/buvoxidorujavoga.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/33846947848.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/rejekuwum.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/67160830265.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/95311672365.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/75924797817.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/gumanuduv.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c328f4012---nokujekamekugopi.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/16215236451.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/11912560419.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/lulowiriwufazenon.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/efa88c387bdb9abf2e85f0c9b262d1a6/99947920741.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147df0236651---47705720774.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/83136103019.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/wikasizinasa.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/26757684774.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/patedixip.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4c820b7f1---62734672961.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_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 18540 bytes
SHA-256: 0b43aed138ae6682e4141c3808c08b5b4016d1a170784a257ed327f73586bb9f
font_02_sfnt_off00016d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D2F 10564 bytes
SHA-256: fdea8e6d5ea86f2ef8b9951c515689388df4ed1309a5502206a6f03181220fe2