Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ee12ae37bb729a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 21:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c3f3994033c5ff4567f49a96c8c473e SHA-1: 5fe70e557a6b05b659d3bfe3f31ed529acf97843 SHA-256: 61ee12ae37bb729a69243e708d32d20235f51395fdd5b698748475a970662520
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lure users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bungefamily.com/clients/5233/File/7300923592.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c78970fb8---62302024293.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/kufuwiribozibuzadinekuka.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/32503568831.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/tavuseruwurom.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/18152222555.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e09cfeffad---35190998781.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xosidefaje.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/fibug.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/46769723280.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/xenabigedezolefuso.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf9096ad03---vupewamomanewa.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/7122210385.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/mimaguxop.pdfIn PDF document text
    • http://fruitsad.pl/images/file/wepozisaxetolafog.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/53435309723.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/na1ia87jekudp1fn5tlio7crrf/2701440002.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050418011431.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/6rnjonirb54jh871bcq7pi0hn1/domipetogarevitevoma.pdfIn PDF document text
    • http://minerva-collection.net/files/files/71257045352.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/venoxezov.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a238f223b98---10653308088.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/89592276529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=manuale+d%27uso+iqos+2.4+plusPDF 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 17676 bytes
SHA-256: 343a2957dcb77abdd48d3b57a47b1c3a2367f47886fb83f7fe562b2c8062d0ee
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 10724 bytes
SHA-256: 464966c239269c462792b07bc662c94e23e549a104375299b9866764eb0190f8
font_02_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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