Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bca5a0be3e0c02e…

MALICIOUS

PDF

89.7 KB Created: 2021-09-11 23:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e71589802eeae19ae1b59c37c88e1351 SHA-1: 8efd4252411d14f2b927e1a3e52a4255411123f2 SHA-256: 7bca5a0be3e0c02ee063dff04180db424ed059768952dd3bd83bf393378304ce
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The PDF contains numerous links to external domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting, suggesting an attempt to obscure the ultimate destination or host malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to deceive users into initiating contact, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://marblobaths.ph/app/webroot/img/files/90086011168.pdf In PDF document text
    • http://www.companyforte.com/imagenes/editor/file/21174387227.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/38866155079.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f94f999a0cc33ca9c1f945a34fb574c8/76740913115.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/95665245600.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109041200005299.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/lobivelepus.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/8a34741eac8c07e734188cfc224b272a/57076591441.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613942ded1715---49254687438.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/tagokexutujize.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/71411189939.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/roguzose.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2e49af144a4643c40a0ee1826241c835/temegalimas.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/58995467634.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/jimuwibufefipadixate.pdfIn PDF document text
    • http://aquatherm-graz.at/files/54419221775.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/kadikivokoparufametipaxa.pdfIn PDF document text
    • http://dhf-china.com/d/files/32431170138.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/tatiputebig.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/xabekafezig.pdfIn PDF document text
    • http://vtaky.sk/media/file/weririguduge.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/27641329839.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/53430848072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+kikaider+animePDF 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_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 10172 bytes
SHA-256: 9e7d74fc6dbcf599a59b3c6ea5e64c6ab961f5e6d31061e00c75610a142ed47a
font_02_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 21020 bytes
SHA-256: 867a86709689e94275474b625ff46795df43a174f7bcd4241ecba12d9980b426

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