Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4a2fb42d7f90cc…

MALICIOUS

PDF

74.1 KB Created: 2021-09-13 16:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 04b198fd77739ef7ab1aca423c3dd420 SHA-1: ac8e240068e14f6e0d498172e54171275f19150b SHA-256: ad4a2fb42d7f90cc64b6fcf291b9fd8f16a9f6f5aa4bf370f2935aca51939ce4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users to phishing sites or download further malware. The PDF structure and the presence of multiple external URIs support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=pokemon+emerald+but+every+battle+my+team+is+random+rom PDF link annotation
    • http://hyunsin.net/userfiles/file/manebobeb.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/83508652148.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/94224186944.pdfIn PDF document text
    • http://agilesolutions.in/uploads/29534661842.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/90013686929.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a95c9e5807df39b2872fccee4424736d/lojofamorex.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613561ae6ef2a---81894153371.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/regogowunepufiji.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/rafedud.pdfIn PDF document text
    • https://dm288.com/slicice/file/16567058666.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613082f7a6f93---tamuvadi.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/24225250487.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/86990352584.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133847d1308a---15296814719.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/newimame.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/xejidikolodusineboda.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/temazabujasom.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/kivuxunimapega.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/raxawiraj.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/wodanok.pdfIn PDF document text
    • http://stevis.cz/files/file/1971393194.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/86534627086.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_off0000bc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2D 10920 bytes
SHA-256: c59aec11cc75c38efcae25146ecddd1c60c2f2f7bcefbf7c114ad2d7f8fa5bef
font_01_sfnt_off0000d57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 17344 bytes
SHA-256: 52c12beee5defa9b166610dde2b8d0b5590d8850062cf320420570d95a66b48a