Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cadb2709c1ebe34…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 00:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30c060a4a6cf479fd0b484f5ff5bea59 SHA-1: 6dcde7b9811bee6789ffc755db60b41dd8cba70e SHA-256: 6cadb2709c1ebe3420fdff296cb94463154e5a95b8c1245c6abcfee0d5f5c95d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting sites, a common tactic for phishing and malware distribution. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, likely for a scam. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://hyswimpool.com/userfiles/jizizimexofebaduxinor.pdf In PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/29879ac7a5e061385dca001a5d446557/pegepizerowimakubajisekir.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/64194187312.pdfIn PDF document text
    • http://falconltd.pl/cache/file/7226225325.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/puropogonopuzizubifizabe.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/34616206538.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/kilutodexezuzo.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/melotuxesev.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425f13420b7---genuxo.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/keluvinasoporoleduwav.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/25721223495.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109050334336255.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/96183171189.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/76581305254.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/dowafe.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/614018b6ef08e.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/bumuvidovunoxofov.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/91581687053.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/a4ssnas0rchbe5jvbloild6cq7/56386990114.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/76320619899.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/43160350915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+garageband+android+2020PDF 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_off0000b945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB945 17816 bytes
SHA-256: 6faad6834ff34c905bc7b4a58d70f96073ab3c820e1dda589658b5f95dc49c92
font_01_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 10628 bytes
SHA-256: 942c7232811fe9ca02bc2769f1a456ce179d86d87685dd3827a38336c1d1804c

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