Malicious PDF — malware analysis report

Static analysis result for SHA-256 0093c574789989a0…

MALICIOUS

PDF

79.7 KB Created: 2021-07-16 23:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed0b6a4d3db8a1c266a9731860d98a25 SHA-1: 7527afaecb1dcdb2b28efcbdea28c7c6a81c7da1 SHA-256: 0093c574789989a0bcb61e05cceef5485555ed3b06b733cba8f2e9147ab6b52c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious link farms designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://austarpharma.com/upload/files/40866471431.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfabd778fb---monowotatevegom.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/74503734053.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f138d450b48c7c8fc6e5297cfaf8d26/pibokoxi.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/5524524511.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79f4db208c---27050495084.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/29165476288.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a7664706---rabonopomeserowibeku.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/55c46faaa9a92f5be2c6434464469967/kejobe.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/xudopuxofonaxe.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210708162573665312.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/14535687208.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850e01919d---36811415947.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/wixoni.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/vijobasisipovizegavego.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bebdde530---wuvorobidepudolamogud.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/kukodurimibera.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1bc50f202---zonojixanefuw.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/m0hldhoedomai78vmcqt37q7tk/80409940239.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/c78c2bcbdcbc6ef8f70891c94bd5c140/39972003784.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9v1q4p34gd2matg2vk7fic3aie/sefamuw.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2430674a---81726699737.pdfIn PDF document text
    • https://xistenze.com/files/files/30289112992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pointer+to+vector+c%2B%2BPDF 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_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 16728 bytes
SHA-256: 378cd15ec4d20291e2bb74a81f7b1f494c51587be36b488292c8b61ccd8d9ff4
font_02_sfnt_off00011bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCE 9912 bytes
SHA-256: 5370cae1ed936512844c6529c5142ef67aea787d73e47eb321570edae7b638a8

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