Malicious PDF — malware analysis report

Static analysis result for SHA-256 07874f6d868a8dc0…

MALICIOUS

PDF

77.3 KB Created: 2021-08-28 10:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbaf1b497cdc5d60631dfb7a820ebaa3 SHA-1: 22e5779dfd96ab536207de7780dfc57457770bfb SHA-256: 07874f6d868a8dc069dca29b34e13cd979a3f2aa31663003de2ea1bff6fe666e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging T1059.007 if JavaScript was used internally to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b1df51b60---wevetavox.pdf In PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/25def54f9ad72b05b7a8825c880d28ae/norizurape.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/65868820777.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b7fb75c7---karurosozamesijovanu.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/bamunuvinepinategefevuza.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/17070866928.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/581c12c8cdcf6a10f00077c53c560319/64033936062.pdfIn PDF document text
    • https://isleo.com/i_photos/file/minabawilexuvopo.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/nurekinunude.pdfIn PDF document text
    • http://vkts.se/userfiles/file/lifilapufojafakeledor.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/1957112662.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089426b75c45---24188130924.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/55400692966.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/teviz.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/saminesatupudofus.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e45e70d074c167a4758e7152cc7d7306/lipapezusogumaxuw.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb72b9f68---92214480939.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/83475973591.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1ed90b5a66f9c9b19df241c59018df2f/3236702743.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/r3rsgb56eaf35d0gjfhjto9uu7/rorowoxadifupovibogo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611277334298d---logazuvalutofuvojo.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/28991860662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=airtronic+d5+manualPDF 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_off0000caf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 10444 bytes
SHA-256: ab0c353e460cfc4a011d8f7e8831a676e289207a74572ae0c423b3bf1e3a2e80
font_02_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 17108 bytes
SHA-256: bb1f368dfbed3eb83d80fee10e684df9d4d9c71e7c9231920d91c8a96681d37b

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