Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e70db48873d33bb…

MALICIOUS

PDF

72.1 KB Created: 2021-10-02 16:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4df474e5781ea6765e4e9a7b92ecd82d SHA-1: 0c4d7ca7a803b18dead692784f19e6c58de9e54b SHA-256: 1e70db48873d33bb45b74b12fa6d1b07d1d81366011a56282db284375b27a353
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number under the guise of a billing or security issue. While no scripts were directly extracted, the presence of numerous embedded URLs, some hosted on compromised CMS platforms, suggests a phishing campaign designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=hex+to+plain+text PDF link annotation
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4b6b1e7017e007282938057ba5477fa4/52453903278.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/71045745099.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138dbc09185c---vapoxaliliwofavodomaf.pdfIn PDF document text
    • https://best-label.com/upload/files/91270154661.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16153aa23b7568---jikobositaporekusumepopij.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/53487017091.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615410c3e250f---kotefoxorabukepaxivanixal.pdfIn PDF document text
    • https://kueapem.com/contents/files/zolipubabupanerovobo.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/5768330863.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/tonumazadenujaxumar.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210919_123644.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/xujaboxewagamun.pdfIn PDF document text
    • https://nomortiga.com/contents/files/40166421988.pdfIn PDF document text
    • http://cobmedia.hu/include/nomukikatevamubilorixix.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/19587395811.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/49940594241.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/xisolidekusewasabi.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/nasisadixipiwebefosup.pdfIn PDF document text
    • http://coumert.com/images/file/rubaxotoxemukim.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/49357486082.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/15233430515.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/60468739789.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/7976099676.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_off0000b7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB6 17592 bytes
SHA-256: aa0d99a6d71fb7f8864c7ab5fc12a4bdbdc43178b067ea6dd36a60b44447b258
font_02_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 10072 bytes
SHA-256: 5a2e8364723f6a0937512c6da2ead65bd732ef014c9164535c0f376299e5ba70

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