Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad7d2605620ac72…

MALICIOUS

PDF

93.0 KB Created: 2021-07-13 14:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 710060c23f673b466d98986aba41c760 SHA-1: 971948486482abd5be9f751afc6ea942c5810622 SHA-256: 1ad7d2605620ac72aa0819e8deb90b9cb4becdb45fac01efc46f0af4335b87ba
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, likely intended to redirect users to malicious websites. The document body is obfuscated and does not provide direct user-facing content, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://pistant.ru/uplcv?utm_term=noma+time+and+place+in+nordic+cuisine+pdf PDF link annotation
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/68305318515.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/17266936229.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091596b0651c---33588023419.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8bb4ee03cca607b19ee6868d5165e23a/xivel.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/5lf0g3qhabd6qq93il58l4qchu/59502814190.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/dccdaa8f6e26a98aac7920dc691399f6/75597083215.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/tb368cem6h5amtg54i37qb7sdu/43060440197.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/49639868217.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/a0329be625bf117e730aace892bee86c/derapagixe.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/292c11d36106576f8b7b3d15bdc31684/20818752432.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/55254239671.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1dff42a51---lugurejovoxoximefu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215132158284312.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609201e1393af---4731217565.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d0c6a87c806b9562e95743015e9af65c/53117196386.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1516586b23447263b6142f963cd4e4f2/87797055838.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/onhc3bo7ci158ut71ovqr51fr2/95598750167.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210619045029.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051113534673499.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/j2opvup2e1kv5ep6b7ijgmb4k7/dafufefizixafogazeba.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/00d5fd9e54a2a61b97b9df33e463c665/28860928335.pdfIn PDF document text
    • http://asustainable.com/global/file/nexalej.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/begoxovosuvunodelidavaga.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7fb026973a408a1e39f9a3af9cd664bc/48566404803.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/jorujixepizop.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/58353825294.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_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 10860 bytes
SHA-256: 4dccc3d8f297593b70a5420b7944edba8a15620c94e663b32a5a38a02f4d2a6d
font_02_sfnt_off0001395b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395B 18168 bytes
SHA-256: 9799d873ba432557bb500b44c63685577112bcf1b16971147a919d4bc3b2df7b

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