Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fff402af6601e8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 06:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c78a994dcc04f9e178a0f49d85cc0b9 SHA-1: 40e9aa2007ed4401b9a8989d2b52a110975aba00 SHA-256: 50fff402af6601e85b7484958c58bdf01153c4950c70577540ef314bc15748d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=how+to+update+your+software+on+android PDF link annotation
    • https://djennebeads.com/nbloom/fckuploads/file/65380816096.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/60810712954.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb6d7fb98---32937452572.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/rigenesedupe.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/90220708514.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/zifopelokavida.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/45386914573.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/vurenekigubamovezufesux.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/wajatiposuboduwizud.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/kd5g62rbj6932miiscpl9gp7j5/94300047244.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/31991327164.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210905162136_6hc0e2.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/bexiwitewalulixebamizopad.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/23281268271.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/71036530085.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9n40l51ot07jap3o0vjjsgq7tj/68604665714.pdfIn PDF document text
    • http://workontext.ru/media/file/gesibo.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/81180082008.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/bozobixuxaxudeluwimu.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/69558543654.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594a6800f9---19483941774.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/savapixinegefinotuzuxi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613793429ad11---66594435445.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/78077780161.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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 17688 bytes
SHA-256: b96f0ab6acaa1ee34bc8fd9203e5d7c16e457366d1ed27e225dec3b11c95a12b
font_02_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 10736 bytes
SHA-256: 28987500f314a5a267845943443e70eba7733f432ad763d2e74aaa2245482269

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