Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e4f8a62c5b0f13…

MALICIOUS

PDF

113.1 KB Created: 2021-06-26 19:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4241475b2fddbb4957ee4eded7c7a6c2 SHA-1: 46a191373a47d3628f238539a8ae695642e99dbc SHA-256: a1e4f8a62c5b0f1393467ff5b356af97af0a07c1993b8bbe8ae27bda38dacc30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da08a9c54---dagijokenufujapodogavab.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a74f4dc1d---11870751423.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/xisevozab.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/sovudatalukikibuwovutesaf.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/93c6ee00e02d8c1e856b9006e1a4913b/57984854731.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/52645762566.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7el3p8j9n55cuj7pjnduqbh4e5/96876984852.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/77671014417.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7b6439b79ec8b7cfcdaf19ec42ba8d63/kevufatovokigewe.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ca4cb7244---44051761631.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/51157703554.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/qfecotcjvvsc7esjjomq7243rq/navotenufaju.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/viviguremakipixorixageku.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/65002658947.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9d0fbf38882789108f3e583048a3082/dajoburetibix.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/0selu8tfd8djvu7botn1ur10m4/23096669855.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2ddf0b97adfb23c10e1a90b97586f516/kizopuwiguwatix.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/84540759f7fd2cc3e03e9f0246a86af4/50875297033.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607957ac6f7bd---zikuwiguzarufotifugidito.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/nipu76b3jf5qdidqu7vio75e01/dagaxomejigafubabevozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+fast+times+at+ridgemont+high+123moviesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001367f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367F 17380 bytes
SHA-256: 4dd574d87bd4e1522add5a2e36bfe8ad7dec8fc7785551cc0dd91ec3a171922e
font_02_sfnt_off00015028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15028 22328 bytes
SHA-256: 8ae0fd7b5afb0ae055e3e1423a21ed86e5488e47adaa81d3c9f6921baffd0b99
font_03_sfnt_off00018942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18942 11280 bytes
SHA-256: 2cbd83544d256f7c5080f4db338ca562f8609135ddf7cec1109d8534e377abf4
font_04_sfnt_off0001a38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A38C 9036 bytes
SHA-256: 3f30313d6b69c6009a59ac801e528448c3117aafc13732dd0118d77f50969ae6