Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d2f65e9569aec5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 12:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7ccdb4e108f8e5e0419ed915f77438d SHA-1: b379b1ef705960c05b13bd5a0bfc6f4c17c82da6 SHA-256: 78d2f65e9569aec5ac063867e743dd00eeaa0eed7de9d17502fab179070e8b67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://inarchengineering.it/userfiles/files/romipegaxilizusokuwos.pdf In PDF document text
    • http://woodbridgeabw.com/uploads/files/87899276332.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/34713888855.pdfIn PDF document text
    • http://medica-brno.com/files/wexamavaloresorupavapebox.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/masemuwaxowavosugisoba.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613453e24fc94---97955550836.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/lowugarifamagiweji.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/remujutad.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45607868206.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/jofamuluxakutixuzezevexoj.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/zuzerujoxivixegejonosa.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/zafijuzuziduvape.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9281c110---87700631155.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4c32a03f---lenuguwaraku.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/xatixagosogifubemi.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/sutabofozepoziz.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/42921509604.pdfIn PDF document text
    • http://lobi.md/userfiles/file/reboxeduzubosilemopozor.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/kokid.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/77547470988.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///39909655781.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1b535abe1---mufej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+tell+what+apps+are+using+data+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_off0000df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF25 10848 bytes
SHA-256: b88592e7b33f9950d6527851eb409051275be76b2523595f2c492a8ffc532b0b
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 17084 bytes
SHA-256: 4a3f3e365a716f733520e1198016204aeb581cae707d6e41a798d1ae1c8c19ee