Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f02544cb48f456…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 12:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 622cd98d488c852fdb50d877dbda5504 SHA-1: c2f55948b4c6b96490e4ba3850d705269758d767 SHA-256: c1f02544cb48f4564cc16e68be66039f90c44ee7411f58b87dc3029c9d1156ba
216 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm pointing to compromised CMS uploads and a payment redirection lure, suggesting a phishing or business email compromise (BEC) scheme. While no scripts were extracted, the presence of numerous embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161243540e0f2c---madinimuvevaluragonitu.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4t7pg56ldsv5srh3eqiskod47e/magaledadatap.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/faruxuris.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/74205634061.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b105678f0fd---78008110801.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/zijovodevuluzativagudi.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/39210807025.pdfIn PDF document text
    • http://asfalon.com/__files/file/81954758585.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/u998uiihhm9lqttl63uneheiba/14684160067.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/27883106293.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/66962046704.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20217281611418309.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/83202053739.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/43238932401.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108230802008408.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/libimuvogu.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/disapigapililazine.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5ff2c7de---3359602139.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/96008826848.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/20249171880.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/iq6ouqof6dkcgobk1nsnm5d4as/69570279172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=progressive+tinnitus+management+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/56739294508026ad190ea4d555a5ccd0/sofikadilifejozenas.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_off0000db8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 17188 bytes
SHA-256: d1b399149e024fe94019b1407957d605602b75287dd57c9f25e4af04f5a162a3
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 10964 bytes
SHA-256: 12dceac2dcef76a957dc218e30cfb82399765f320313e54431b83023b6899d86
font_02_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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