Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d864fa6a4836f3c…

MALICIOUS

PDF

98.8 KB Created: 2021-09-02 08:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18ddd5483a3a098da26cb79b57251959 SHA-1: bf3fdfdf72ca1ca5bf3e68a4860b96ac9cf44512 SHA-256: 8d864fa6a4836f3c31cb7a809d7e19e978bc8e44a36ab5f471c3ba2b0a2a9095
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier flagging indicate malicious content, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external links and the overall heuristic profile strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pistant.ru/uplcv?utm_term=algorithms+for+dummies+pdf+free+download PDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/55d1df8506375188ba5f67d1ce19b1fd/72098700755.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/e8e5b7dabb7e0c000340e7c7ea71b044/10583824864.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9e31506818fa24ba65bb7907da46ff90/nesavomumofilipepotexik.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112b7f404a4b---widipobelatedixuwebisi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce61ac7121---71599425942.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/56114020495.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0fde0b66d6---62517508809.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/55953920562.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/57dfb68fa7dd6d523c06d009b51d8d46/11366292408.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/73760261011.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a092e4208d---nizadapopovomerevipila.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/gukubexakiresebejulofew.pdfIn PDF document text
    • http://runo34.ru/attachments/file/dasubaludazanuluw.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081713f0c9ad---zewawen.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/32573021047.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/20938842916.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/wuwamela.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/rekonopitamet.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/33375019568.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160753b31c0962---zifobumawosujobupibedopok.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/gatesalivefe.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/43305729795.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_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 11112 bytes
SHA-256: 11520aa51dfdbc4b0495db174638d0c66355bce5172f36ec5e28913fd6f3cc58
font_01_sfnt_off000134b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 18328 bytes
SHA-256: 43fb322ca0ab1c809baced3cb4947f050a72a25b4128aa4dd3ff90278bdd677a
font_02_sfnt_off00016458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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