Malicious PDF — malware analysis report

Static analysis result for SHA-256 a237a14292299cd5…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 19:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70b860ffff2d3bdaacf5d1ae9a53d2d7 SHA-1: 1ee5992ecd0c0ec7c895ce8644d7b0172e340334 SHA-256: a237a14292299cd5114c22f81f2cfae0fec3932ffc891c61ff41a43c22562d7f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised websites, many of which are WordPress installations. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=pdf+qr+code+generator+free PDF link annotation
    • http://clubesquilacoma.com/uploads/files/letisudozukarule.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hoqev9602ba2ed3ifrksh5ea2r/29534312751.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/rowuv.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/liwipibinupinerizizozela.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118f057d3130---41389795404.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa03c07534---mokowetikamolewuwunudorog.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/xosuleduzafedapif.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/90266833313.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/zazamuleb.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/lepexuduroteme.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/36089782557.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/denewoduwod.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/majafis.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/699016477.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e396879230e7b9e721dabbfac6d45c56/87890918879.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/sovoluxa.pdfIn PDF document text
    • http://gtshotel.it/images/file/96457413888.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/bajilidevofobosib.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/20178927091.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741c1670802---26529667842.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/gixukewejedo.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/48564342598.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/43482770998.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/zizosafokamuzixasug.pdfIn PDF document text
    • https://equalland.com/uploads/File/54547529055.pdfIn PDF document text
    • 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_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 17984 bytes
SHA-256: 3ca5be2b12565788be1f0f65cf6482b73b2f7ce0b824796396b95c92b92eab13
font_01_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 10492 bytes
SHA-256: 0c1d1c6531c33761ec0c3d72c5fef207ebd9bc4065620619fa7f023187ace46d
font_02_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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