Malicious PDF — malware analysis report

Static analysis result for SHA-256 122f41c2e7a046da…

MALICIOUS

PDF

79.3 KB Created: 2021-07-02 11:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92195cce9375bc89cfa65f302fcda1c8 SHA-1: e1e7f8af7a1f4082941bab803fc9b6177c3c465c SHA-256: 122f41c2e7a046da3204c48e6a8f34c1b02d36d544faa82c5f1bc82855468e37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. The primary function appears to be acting as a link farm to distribute traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://queure.ru/uplcv?utm_term=tangent+of+a+point+on+a+curve
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/tikipexa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847503b2d1c---lixok.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/85f5199e3fc427b16dee3f4682f754e5/xadafota.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/s3lhmjlf8ht03gm2t7r0lb1q02/vabuwu.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//68738655757.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608111ce09bec---64512335455.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/48b6d5d1de7e9dc5ba2ae34cb562c38b/datubito.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160899f7388bc4---dusipixezutolol.pdf
    • http://amexeuro.com/an3_Uploads/file/zopudevekuwoxam.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/c48c0a7d55e353ddf7cd00dd5ded5aa8/rukipim.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9e8964ae4dcdbd96ff85724985ba660d/bodizogejikago.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/ruvukubofonugifijasuwe.pdf
    • http://deasreunion.com/clients/860224/File/bizedaxexibigusijalajuxos.pdf
    • https://nevisnews.com/userfiles/dajexibejavapamarolisoga.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3140df6d4---7719638573.pdf
    • https://vildmarksjagt.dk/userfiles/file/9521391430.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/656a7575a42ecf2275605815170fc97f/fazazoko.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d18e2ced5---vajapafibiwazogupep.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/0c1985fbaea402752b63ef7173934df9/laromitug.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/53966151983.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/698d965c66843aaca75c01bf2ac12072/vofese.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/8f0033b044f9b5d0129df88fd8f390cd/wupaxisukegafaribu.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/48684709604.pdf
    • http://kpdb.org/userfiles/files/67188264078.pdf
    • 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_off0000cfb3.bin
17f3c722b5af7c6915c8d5cd6a9d25339676adb60c83fc8058b34d9b1303b47b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 18052 bytes
font_01_sfnt_off0000ff7f.bin
6f4553b06f92b7a7d1b3087ef24e13786659774066a12f89f19a7a858f1abbcd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 10572 bytes
font_02_sfnt_off000117cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 16792 bytes