Malicious PDF — malware analysis report

Static analysis result for SHA-256 668f61bafa82f5b9…

MALICIOUS

PDF

97.2 KB Created: 2021-07-23 09:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b3d289fd2b59256d327cd73a3ea325ae SHA-1: 6f8bc52e3e623af00f0addc659a65b33f211174f SHA-256: 668f61bafa82f5b96f663ead3de810bdf773f2a746048e325a150c473bb01ba4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://urgentcarepb.net/userfiles/file/54717576088.pdf In PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/56101757328.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160932fbb22ec8---pokis.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/61340693168.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/e8850fd04d8aa9daaf9fe588b7652fe8/vajad.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/kugalaferuzagikoxos.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc111def18---68016543137.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/367ddde547569221c25fb4a59aaa03ab/36278677961.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/89472225931.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f2ab0a04---82667571070.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/11075777713.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c199b0cac---nerugodubatiwuropevonoxud.pdfIn PDF document text
    • http://peaktoppet.com/ck_imgs/files/29796810695.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/35967314130.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b0da11d23de72dfc8ceb96e7802493ed/85930184266.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3b28ba36c440dd52dc22f9474b049fc5/xedesovenewem.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cd5f900cb---kowajujafimofakiwazuwop.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/61c0063eb0642d7640d1571eb7659807/52123590558.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a9701ababd2---wumemobusitezesakuruvisix.pdfIn PDF document text
    • http://packamate.com/userfiles/vigunoputijajurufovu.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5f10633f21313b9ef78c17808a510724/64850014147.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/fepafipole.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f6a39ee4fc6b63999a1f98e76399df59/lifurexuzafonumabovuvilar.pdfIn PDF document text
    • http://gonuldoviz.com/upload/ckfinder/files/69623620082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fallout+new+vegas+how+to+hack+terminalsPDF 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_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 18388 bytes
SHA-256: fc5856cf1410796e7a477589975d5b7aa2927cf82cc541f1135c5a3bcb5c90f2
font_01_sfnt_off0001458e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA5 11000 bytes
SHA-256: 4269e2b90697de5b89cf6ce56f529bc5f8773aadfd146682919119aeec6551d5

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