Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab65e7fbf342f604…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 08:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99a2d5019bbd9dda396b7f935761b3a0 SHA-1: 7be176bdb647a97b75c8ef702f079c645ecbed35 SHA-256: ab65e7fbf342f604eb3f4f12b7cc99af121d48fd404340086d7da6547175970f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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://kermiradiatoriai.lt/images/files/mebikujovefodi.pdf In PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/5e3079a4c58ebf1a70d9e01124549107/42053453896.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/45567631823.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d40f34f39---46261571836.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/7757871ad30a91c85ce6b142ab803263/11636011263.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/zilupodalatudevu.pdfIn PDF document text
    • http://belv.ru/userfiles/file/56179053300.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/mapiwejowizov.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/35726853230.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e571f661e4---92893139769.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/07e9a33fb08057e37e9e467f467f277b/20943121532.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/49305512144.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/xitoxuzajakive.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5dkfghbrvptkhi6bsp2v10rp4l/juxidetelakamavawijanode.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/61053564205.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/falef.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098acfca076e---27945410219.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/doxetusopagufidufazefu.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/wirajulosisadarodi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49704fd2b720e20f246cf8b1e1c12a93/tinujoxejagapuweda.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/xafejodewutaf.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f8500336a6f8f4a46af61cc034ff261d/rononupumojumefibebetag.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4d3f8d27e33790865f64e4d0dceeed74/palewurelabawukonefetigij.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/muwute.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfce0d229d4---66916853458.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/9d6b2ad522f867d828655d094d72d7ac/68152323538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=honda+ex5500+generator+repair+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_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 11016 bytes
SHA-256: 6e6a6d3fb73e4aa6b4347a85c6c79f0d2de296ad7c58c1966c61ba91f0c33b10
font_01_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 16712 bytes
SHA-256: 3872637c1055bf42b980daaa291640c837cd78c032724019b15531cdbba11674
font_02_sfnt_off00013357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1