Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae427058d8022ff…

MALICIOUS

PDF

84.8 KB Created: 2021-07-19 13:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0cbe7535808d272cd598ac2123efb622 SHA-1: 4352d3787251f3a95f8eb83ae72654fb3aa6aaf6 SHA-256: dae427058d8022fffb65b6d509dde167af41b0fe417155edcdc4d24dd9ec1138
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and link farm structure suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pileshoppen.dk/userfiles/file/61502582214.pdf In PDF document text
    • http://clinicoral.com/img/userfiles/files/dunoxukovugawozuvepe.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/72944664169.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/pepin.pdfIn PDF document text
    • https://mytopics.it/uploads/file/59138568087.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/10579258616.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608529d72c882---5503070277.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/34319932495.pdfIn PDF document text
    • https://magerp.org/upload/files/kalimewo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609655280d1dd---bifosekesujififapi.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vhpjdb9u281iaii5c0heab4pk3/jotijixo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071af69482f9---29108620905.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d0830315c8b8428994a64123485484a4/rewesuxusesa.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5b4827efc0a0c8f298019bbd13b545f8/37857340604.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/56723177779.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/62ef4966cbd6c90142da654d56c05992/76804888389.pdfIn PDF document text
    • http://candientushinko.com/images/file/49443387499.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/94559153813.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc23c74667---bepelixiru.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zewanuratenaxif.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/qircf4hr7mrigc53ir79oojsgm/25259699433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=real+life+monkeys+for+salePDF 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_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 16852 bytes
SHA-256: 5644c6ea07787c0b6c23c12b78b2428a8b0da49556d6edc0f1e153d867672ab5
font_01_sfnt_off0001166a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166A 10528 bytes
SHA-256: 64526a82cca390105022b80b9f5bd1252a8c64d020a9e15341583ae95e9ae4a2
font_02_sfnt_off00012e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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