Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dbb1696ae7a902…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 08:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d3b957430aa2ec96d84ade003f1af50 SHA-1: 3ff0dd945dd865e5feee5e3c3f33cd22e1abc4ff SHA-256: 33dbb1696ae7a902052ca4bdeb83ca552ca0f36f5e6e7a521954476f5e73e49b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

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 http://felixefontesadvogados.com.br/ckfinder/userfiles/files/metifosunu.pdf In PDF document text
    • https://editionsitaliques.com/userfiles/file/76659766225.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/31b3d064fafe2209184f4f25861958e8/25935284024.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/67420256337.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/50407867212.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613527f416bf2---53660514748.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161406d4729736---roguwo.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/78681880453.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091101384973499.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/56512802244.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/82283872468.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2mm8orkjl0f749gtlufmv2q1g5/dexexasesarodobiviso.pdfIn PDF document text
    • http://tid.vn/upload/files/65781186959.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/gusepujuvosuluxikozitete.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109130329534811.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/86742558335.pdfIn PDF document text
    • http://planbmedia.hu/files/sizesujaradojas.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/nijaganir.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xokibodumanikoxadivavo.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/ratokazeweve.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/30747225032.pdfIn PDF document text
    • https://blogsma.com/files/51764555597.pdfIn PDF document text
    • http://idroter.org/userfiles/files/49541324424.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c359ce25026754a9bd6a11b4602cab46/64112684390.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210908011923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=svr+secret+video+recorder+apkPDF 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_off0000b6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D9 10588 bytes
SHA-256: 3dc603386a793fab7e067ab3018c161749fbd2c6082578ae816c42dc9806bf63
font_01_sfnt_off0000cf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 16120 bytes
SHA-256: 96ec76c47ea5132f3675fc3ab075649ce1be3d86f9505a4dd34e2eaf47c759a8

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