Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17e99eea5dad566…

MALICIOUS

PDF

97.3 KB Created: 2021-06-30 19:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 377344d034f3303aa96beb5f33700321 SHA-1: cb8f47e22294cf201b57ac6970085eaa830338e4 SHA-256: b17e99eea5dad5668c7f1d886c3fa0cfb3900d1218b45818f34b987f95f439c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload directories, indicating it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9712

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://a-swiss.com/upload/userfiles/file/fovizegoli.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/467a720ac20ee1f819e7de8a46b47af9/zorerelijajexibesez.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/volipigejure.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b14951af911---ruragafivuzemagobemuxep.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f1aba1fe71---96912725607.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4c4372cc6a7d18481c085fc4d8feb8bb/nuwexozi.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/28532188768.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d5dda64578373a22757a67109678a43d/62849636236.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d187912ae5---2971345175.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0a1a19050da2a36bae92711f34b2d900/96240162977.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/4011d5d1672c8a093f0520e4eef22546/nizisamisibumake.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a501686c---63088948164.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/negiwagus.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/loxobejazoxi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/gllma0m7tbkc44e1gt1krl13g8/46668242591.pdfIn PDF document text
    • http://3q1p.com/upload/file/210625023807718751095pu5pntrmz.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe94e20995---50137529870.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/633e5ba828d5d8bae1deef1eee72f56d/1247608440.pdfIn PDF document text
    • http://kingnature.ru/files/files/15078691046.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/1jsbfjqgfrfqna6lpd80rpbpr1/gutizifufavu.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/80305928725.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bmp0u5u51endpm75q7utsr95m4/6754551524.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zugasararatenetaxiziw.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea0af9d3fa---22660367048.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/0mc4i8rcs52g002c1gunm573tf/25013352354.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160948ec035970---90955143481.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/94658218446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=visual+cryptography+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 18392 bytes
SHA-256: d3b952d8c2dab57d35f63faee292544d534e85617bce334fd0d49ca18fdd78a2
font_01_sfnt_off00012f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F54 16564 bytes
SHA-256: dfb18ac911fe7cd307ebb3b65829c5e4b640e5ba1f2d4bc0de239c4ec1442042
font_02_sfnt_off00014653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14653 10848 bytes
SHA-256: 607737c7da7cfff7e3b2886cecbbfc3435576f2c11293d2a665c587631bf8f73
font_03_sfnt_off00015f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1