Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74579e8b146a9f2…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 04:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 024ef35ba5d17cfab680b6766c95713a SHA-1: 35619fa1ca486fc6b610e93adeef43284513cf9f SHA-256: e74579e8b146a9f22ba9b64c87cfc0503c6996e6fbdddac660d346b9e9f06ee7
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 or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings point towards the document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=obey+me+shall+we+date+mod+apk PDF link annotation
    • http://melinterior.ru/userfiles/files/77235326529.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bdbc66fa4641e6b031d46150b7b5f76a/74637540839.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/sogida.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/58894044289.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe48cb88ce3---54771431598.pdfIn PDF document text
    • http://flirdining.com/uploads/files/pexovageporamegazov.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/5398de32396e2fe494c35576af4736b8/fawitivezawoduwinomevaw.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/50839480743.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202108171823024970.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/9cdde911d36fa165d0fd549aa38d85ac/8294823926.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/47675556954.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/2491357539.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/xexugazedixiperakobikat.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/44860379407.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/misonozuzuzalanesoxa.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/woxugolaxap.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf206bec5---wodovixelo.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/59108722490.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/bifusabopopotul.pdfIn PDF document text
    • http://gr-chem.com/upload/files/fedozad.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f8e464b80---88433255171.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/dibosakowokadazelim.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c3a8e51df4e8714fe06d223173a356b9/siwenal.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/xajojimituwudipa.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_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 18464 bytes
SHA-256: 4acff785156e1e204b3f94d8439b410d4962fa92f192338659308857729ff6a4
font_01_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3C 10816 bytes
SHA-256: bba64e5ca889095049c67de766b406bc3782b4780084e1f065b00fe5a69d6384

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