Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afa796b75a73659…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 12:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0254fcfefc78153c3e3b4cfec295f56 SHA-1: 64d6e2509d63e1aae576819b306dcbe97d75567d SHA-256: 9afa796b75a73659aca870fd46f983e6e3288218afc391fad5b3c85ba068fdba
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 for fake issues. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or initiate social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nwatchonline.org/userfiles/file/mikud.pdf In PDF document text
    • http://dintainoodle.com/uploads/files/95440424474.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/kejevu.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/55293117523.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e00913681---babexolefuvop.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/wukologubuvuxada.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/23462062024.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/78414129085.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/86740409644.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/lewemivafedezepebiditex.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210907_8D96F131B9891C8F.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/xabakelotevu.pdfIn PDF document text
    • http://clingac.com/d/files/fatupafulefibe.pdfIn PDF document text
    • https://ms02bet.com/contents/files/20945618613.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77661271122.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/vajewerisetodagelusetun.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/betenubog.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/kegorer.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161378c7528ee1---lunodisogemi.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/zovegujariro.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/39740648418.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/67010205980.pdfIn PDF document text
    • http://asustainable.com/global/file/bagobi.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2c8601404ff08589e5cc424168598641/64776952808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+remove+google+mail+from+androidPDF 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_off0000d0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D3 10672 bytes
SHA-256: 4020a38059ce5ae571b4032a268a7bee3bfb03d69e78faeb33a3ac87bcc006da
font_01_sfnt_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 17884 bytes
SHA-256: 7284933ecfc3f05a905d0e2e81811df5156d27bb9bf5be491aac59ee01af00da
font_02_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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