Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d2d11ac452246a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 15:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cec9d07d8f6087c8cebc1fc2c0eaaed2 SHA-1: 7e99d229c7852898039febae91f18ccaa17ad390 SHA-256: c2d2d11ac452246ac3f63c5bba2b6e54f7d6b473893905ca6c16620837004396
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://etonbio.com/newsLetters/images/file/13904529273.pdf In PDF document text
    • https://sieuthimaycafe.vn/uploads/file/31695930424.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/wedax.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/6794658333.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/89774561538.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/26135018901.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095919a4ef---gilusokarimuli.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-6/20210906043326786164.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/bc7ee154e5a3a7b2f0727a7e24a21705/34532611520.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/wuloroligesuporowiz.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/wotinukejavofi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613281b9893af---62611510123.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/kakigapitifu.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/bugajuwi.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/56890370018.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/batoxigizus.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/mibepotigeza.pdfIn PDF document text
    • https://dukupahit.com/contents/files/babosakivolupenuxojumenu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/biramuxivomamezom.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/tujeputudixanejorut.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/gijabukevesavowevoti.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/gagesolisoji.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/mufasiroliv.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/nolebudezuduju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hero+strike+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_off0000d06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 10180 bytes
SHA-256: 30f974d28f346eb5e9d0b70f709ea2c35d69f53f333e4079f7bcd176d0941f10
font_01_sfnt_off0000e75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 17200 bytes
SHA-256: 554338e11d0c3fc43e791d8fe6ef8c1a6974ba44417396654d169d8ef11eb867
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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