Malicious PDF — malware analysis report

Static analysis result for SHA-256 78db7a51159d6879…

MALICIOUS

PDF

73.5 KB Created: 2021-09-14 01:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c908e33de20840097c6fd2ba2b7dfeae SHA-1: 20ef7cc9e676791bc823bd7ffeb131bfa93cc70f SHA-256: 78db7a51159d6879fb55fa501a8e19e666a457dcf29b6aa3bb5dc4173a4d67ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, some pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of embedded JavaScript, though not directly executable in this PDF context, indicates a potential for more complex malicious behavior if the PDF were to be processed in a different environment or if it's part of a larger attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://resortvillairene.it/userfiles/files/velijupavib.pdf In PDF document text
    • https://ixiu-23.com/uploads/files/202109061110337413.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/98620238051.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf90254a5d---9349924989.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/26935631315.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/siborokenezefubikadepajo.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/nafisakaxu.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/julopewadila.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/52941202865.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/xiwebugunufi.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/zokalefokusus.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219418568673.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/jimebikavukuk.pdfIn PDF document text
    • http://immopolignano.lu/images/80469955721.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/99663015839.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/vapipanipetegapeve.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5839f36ba3b4865d079b14655b562bb7/278692898.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161303c0aeaa2d---20487350551.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/2424555744.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/farevij.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/toreleniz.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/weparemevedelezaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=injustice+apk+unlimited+moneyPDF 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_off0000be3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3F 16076 bytes
SHA-256: 3fea1cc2836af5e66d77e0bbb2e696696439830c46ccdbb1923319a7268e1a44
font_01_sfnt_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 10960 bytes
SHA-256: 274aaae4019236aacdd008620356b0975cde489de3f92bd367f050b3866db8db
font_02_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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