Malicious PDF — malware analysis report

Static analysis result for SHA-256 352c3a8cf2142add…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 16:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dcc8b852695ac3da7d466949d3f9f8c2 SHA-1: c34c301ba1b94e65de8b7b3e080c9e817c2da75b SHA-256: 352c3a8cf2142addabc18a869a03f671357c2b5757f7cb0aeceaefb44fbc9e75
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other potentially malicious domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://archism.ru/uplcv?utm_term=ejercicios+de+aritmetica+resueltos+para+preparatoria PDF link annotation
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b24d83692---80865424138.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/9rmkl2314sb989t5a7osga1m9h/jarukowuvetubopud.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/40885931265.pdfIn PDF document text
    • https://edarky.net/data/file/befuxadedomigaduner.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/sugitumaz.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/felizadesuluzogamogasur.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117d610aba0c---debonovuj.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/vuxuxu.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/54512336916.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/80283824034.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8cc14194cadd44f7c7979e76bf9a33b7/4130313216.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f542dac4b---56467767063.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/38254334918.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/viranaxefuwa.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/65610917138.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27db549f12---69696026154.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b75327611abcbdaea440f857769db358/zegirajirasiwuz.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/35067330391.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/71341751039.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/50652795051.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/b32b33978f949fb5e38e5f5b6707426d/14365446030.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/58278325029.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16087024fe05bb---60202315292.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a13f57e139c7a821af77f0e6a525e4e1/89263549782.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c295978adec---zunevefedize.pdfIn PDF document text
    • 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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 10784 bytes
SHA-256: 24d46808c72d0bfd770ba7673a950443bdd3e60b77368966c0e8683bb49a933c
font_02_sfnt_off00010eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB6 18728 bytes
SHA-256: 5607181170ff155aa6e3859e7d52120ffde13b34bc3a62a7d177bf8b2879add2

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