Malicious PDF — malware analysis report

Static analysis result for SHA-256 c128530b33457291…

MALICIOUS

PDF

82.3 KB Created: 2021-08-12 13:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8856697216f72a8869d46df47a79c1f2 SHA-1: 2ac3443ce439cab1434b391a3acf8f09c76920f1 SHA-256: c128530b3345729111b5e15ec1b4335a55224a53557081ae18326566d5125b4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://msslink.ru/userfiles/files/pukufatuliredimaruwex.pdf
    • http://brandiassociati.it/userfiles/file/38905002565.pdf
    • http://adabaskimerkezi.com/upload/file/waxuwajejifiwirikidak.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad56d31ce---mokukuguzokifeb.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/prtamnrct0pi00q00t2ugaqeb4/11186371789.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/693a2d896825620a2f89c5d97a6e3ea5/24844242615.pdf
    • http://ccspatti.org/userfiles/file/tedagekomuwusawegegafo.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8d2456ff---fufinaxotijatipevojegil.pdf
    • http://nanoscopy.ru/uploads/files/voxomusawifesikaremaku.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8067d0027d---5638892314.pdf
    • http://tsutae-f.com/js/upload/files/nematalidaxi.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28873bf410---33224873113.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/legibujamifexodovuzorawub.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc3fe06e8---tisonenugoxonuliwopopirez.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/56a37303715ec98312a923260ca426e8/70849200766.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/85e16e87e0b9c5d350138f2d7e2918a5/kajaselegogulu.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210629044412.pdf
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/26804465063.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609889a9056f5---sixoberulinalewif.pdf
    • http://sendedianqi.com/upload_fck/file/2021-6-20/20210620055446523431.pdf
    • http://aostavet.it/userfiles/files/banasonivudole.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d0738ae13acc830960e67dc7fd14765a/54941690523.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aa70f24ca---82607498485.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/97d07e0f3e2b8be09a3c7ea971aa65ed/61290047731.pdf
    • http://havefuntogether.com/image/upload/File/4512884113.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0137398f---28831174817.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=oikos+of+the+olympians+olympian+gift
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db73.bin
e6d820c66c9821e7f81ad942197e583fcfabb80ee860c281dedc54627e592e49
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 17040 bytes
font_01_sfnt_off0001074b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 16792 bytes
font_02_sfnt_off00011f62.bin
a6b52bd74522a9250dfe6b83eeaad635748594cacbee00e657eafd2b565127e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 10936 bytes