Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1a3f85edaa9980…

MALICIOUS

PDF

79.5 KB Created: 2021-06-26 22:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4088a22a5b1e24c338903462a7b7cdb7 SHA-1: a742de72820da478ddb21c4b9dc21795da405af4 SHA-256: ab1a3f85edaa9980ae3ee0f87d831561e68c42717a2b99d8638bd375082cf9a9
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent, likely to lead users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=free+numbers+to+call PDF link annotation
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/15d8242b8af6c97a0a4b772175a87936/zugeladugezo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5332dcd498124cd951ae1b5d39e78551/kumowisuripivipalusewabe.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/regelujaja.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/66951116982.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/42heqki85u6kis5u7jis4gpqk3/95926731361.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/zefimep.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/46185131232.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c04a911d65f40ae6f1f333a90650929d/zazodimujazasiwire.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbac8e1f4f---40378745747.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/h207j055giq0q18b50muc1e1o1/23027151115.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/96729145062.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b54b71da0c668ebca929d713dc8630df/61325016949.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kfroipcf98f94ik4cdcfvvogi1/73625461513.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f46e8296bd8dcb9185cf43461f82ac1c/puriranupajilositizesur.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/xononaxigosulujob.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/86972069671.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/witekogetawitixesatog.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923ee582ffc---kubuji.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/49fbc0b3067b6295095c2af29d105908/27943643073.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/45068458845.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3a06f7cfe612f2b9680a5630ef0c1e53/zafavoberedupivipobibur.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e019b6df6---95233161079.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ousd2qhbq7ni2uu46a7c0hjte7/15445689878.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/fuvisiwolumuwe.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/25c88a5fd8d44b6bc53ad9a509640c4d/baduwi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/trjk8mr8onlrht5lem5set8j14/90722106822.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_off0000d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 10516 bytes
SHA-256: 10b4f92cb3da930835a7f0e8176bfa824729e1cf4c25ed4531aefdaf022f8f22
font_01_sfnt_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 16952 bytes
SHA-256: 4bb7c125eddfaf837db6eb81eecd7030653deff45a0f30cd9742319119ead074

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