Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c39e1ac4732afea…

MALICIOUS

PDF

96.0 KB Created: 2021-06-30 12:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2ff1cf8f2e58340f4c1d16f960fc6baa SHA-1: 7f5e0beaba677d0d6d78d9e89a2e00344c39e4b1 SHA-256: 1c39e1ac4732afea05075affb9f4a978431ee15cf072972a242926bf26aa3c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.celso.org/download/finetabarelubujijo.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b253af473fd---kivamabexitu.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/16048197407.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9ie4rmmkrqk8tt4j2b3dk7gdj2/84425202303.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160884a8226f99---zurefekukofej.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd00f65e84---44217646686.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/6a99ec09516c9133146a849f5dc67757/perove.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/numupagapezobagujis.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/28096170ad44dc778113d8347b7de61c/betuguritaxepo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/42071360493.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7555e9759---74433208376.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/wiwikerojatiwikunelizajiv.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/gevagi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/394b073b16fd7d326a62b5b3770d832a/neles.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17d5ad31a---79304659034.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/84879893510f2e750ff525cbde59fc0f/zokusokog.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/fixofitow.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/14152723120.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5892e3b4a---vutejabetugok.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1036e877dee6c7ac169bcc2fb929ecdb/33903649008.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/5fmn4d32a9k0kcmol7mn59suq5/titavole.pdfIn PDF document text
    • http://falerisztika.hu/tmp/58717196894.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/ferilimofapo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761fec9741c---86801001076.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857da899dd6---35360339775.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/jikuri.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/monagilokan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hbb+physical+therapy+abbreviationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 10784 bytes
SHA-256: 3e2a4f26d14c15623b0fe79f9fc6c8508721e856dea98be678160dc2d86e24f5
font_01_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13007 17024 bytes
SHA-256: 0ec4a728f374d02129cec9c3bb111587ac5732caf426edc6c9536cb8cfac9c8b
font_03_sfnt_off00015c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C84 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b