Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1691a777048af6…

MALICIOUS

PDF

117.5 KB Created: 2021-06-30 11:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 99f105c0c07d35ebb6ee09fb8bdfa706 SHA-1: 9a34dd968b7553f747c53ff98b546a12d615fb2e SHA-256: 1e1691a777048af6810614bcc2b0c083074d0a38a6b58f6fee623229023025b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://laborke.ru/uplcv?utm_term=meaning+of+subsequential PDF link annotation
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/1f75983dcce1498b39310814cb1ad7a6/40821837712.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ccf2f81fc9b1eb6cbd4ccfb106ae0ede/tolesipapoxoboxurufuzun.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/340ac45cd09e8a199b45f61f82875d57/nanikumemeviwujop.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/pc8u40l2s8uto7628srmi0maik/tadudiwemesufidota.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/fatilaxedawisiven.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/35077180457.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ssjvktpd1a742es7vdfb0h6fuc/51667866621.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/tesovufexej.pdfIn PDF document text
    • https://arerp.kr/data/file///pavoposipirozivanejoduto.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/megixowara.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01a7e8f78---siwasatipezinizavo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160988964cc908---43170046083.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/16196579155.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43204ee040---34409690486.pdfIn PDF document text
    • http://kleiberit.ru/files/file/11866041301.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/40950119195.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/85147438235.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4c37bab9---kazijojifurimoxuzufujuvu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3083212d1e5837c6364322aab3925587/kikarepupogekewomibe.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c436f73157a---wafekixekuwisadupoxusivob.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7887f0541---gumidofidazogekatok.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/28r3knla23v844aa38bmnoreov/mufavivebidegulabuv.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1622666320.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740042c3ac6---29234257845.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd8138d36---tivom.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160966124442ca---60602195026.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/vijapewabilamezupemetav.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001a73a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A73A 19704 bytes
SHA-256: 15a6b9d6a840436f98697876db30be61152d842f0175a0b3714f24b7e8767c68
font_00_sfnt_off000148ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BA 10668 bytes
SHA-256: 4d24e16fb0b458886ec100d4ef3f0cfe44debc8cae9d4d290c6c56b1175e63df
font_01_sfnt_off00016106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17918 17520 bytes
SHA-256: 017ce47a810d68e87a5a2619bfb6477201ec20572c537181e1ba0e6da5d7ee0a

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