Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a61636d8962f8e…

MALICIOUS

PDF

79.4 KB Created: 2021-07-03 04:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2bb5fa95d5a3942b9ea96eed308c75b5 SHA-1: b5fdf0f204ab81fa46c5f5134b7072e6ed0d957c SHA-256: 58a61636d8962f8e03b5a8dc97ebf025b6d2f4a7980804bd0d97c31b467095a2
164 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 high likelihood of malicious intent. It contains numerous links to compromised websites and a deceptive download button, suggesting it is part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious link farm designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/58b67d5695bff9ace8d0ddc0af123091/75083475178.pdf In PDF document text
    • http://pi-consulting.ch/download/sapedabukurafogo.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/oomh0i53uei5ln12096ujgjr4j/fomatofodare.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/pitodafafubawolo.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/rerefezugitofanasudojaxu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb68e993704---xefepolemutisodijus.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/46511639142.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/70014308013.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/8008346900.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b0c83c199bf.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858895acf9f---23777865709.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160de3062f29f0---nufamenikorut.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/575nbfvim3nnqaeccbe9c5k7c9/92874668179.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/5c06700c684f818e0b77bcf1f5b9035f/42480421751.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607287346dfa4---15338788457.pdfIn PDF document text
    • https://okazionche.com/files/37180064557.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d772c08db7c---pejitefepopunabinik.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852cf5d7460---55586412480.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021062706101151.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4f705990eb00c6ea38d1a34bdd1b2611/loxowanadilerupagatowa.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/tetumetimojasunulerime.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/82345a7b90475fbbd18c38fa5d9ace4a/demopatudono.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4885a2d73c---61466614396.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/nr40hlusegqmh8o4a9q5hl6dt3/gawusizenetaxodiju.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e863082e---tisavepavezazekoxuzaw.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebbe287466---lanuvuvabibuzi.pdfIn PDF document text
    • https://sce.tw/uploads/files/60b57c3a35979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+excel+2007+free+downloadPDF link annotation
    • 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_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 16348 bytes
SHA-256: fc889b719b4726ebedf89db5cfd8c2bb7dcb09670ee0c930ec018e6fe727d51c
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 10592 bytes
SHA-256: add5bb3fbdcafa16280f6d721f5d90422c4b9493ad10b469486db10e7dcdf7d8
font_02_sfnt_off000117f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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