Malicious PDF — malware analysis report

Static analysis result for SHA-256 db80d0e1472f692e…

MALICIOUS

PDF

83.8 KB Created: 2021-08-04 18:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d68438057fc400651a043f198c5067dc SHA-1: 99fd95354e7e9db9fd77d5256551ef8fee4dc512 SHA-256: db80d0e1472f692e020b23d13b8b375c62171a0505348aeb51b417442620ee52
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, with many URLs pointing to compromised WordPress sites. The presence of a 'download button' lure further supports a malicious intent to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/828f98bd626bf28ab86cd30bae2e3c24/pasuguxofida.pdf In PDF document text
    • http://auroraenergyproject.it/userfiles/files/kobolitamabofupegela.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/bakuzipuwoxibunipololedab.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4o0miusfdau5rntcuu3tobgks8/56278110179.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/de8a96dff8cf9926bbbec0bc14b97f3c/89158971517.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/jetuxegaxax.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3c00f0183---31908340228.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/kalujaxumegasetizi.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/vumogajatitulusojomiwo.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210707123830_npdix1.pdfIn PDF document text
    • https://ubranni.com/uploader/files/sajijakukemugerex.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16097e4fed1c53---99247341641.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160975f91a324e---65188959801.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4c9e9519922273018ef997bc71bc95e7/25609084174.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/48cqksga96idgkq346gqed2tp4/gesoforukebebel.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa1def4d9---pewis.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/29974957901.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/posonuzulif.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/33395477558.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/49309648477.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/lixad.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6eef38a83---petubugelav.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/14930a84406b70fea1233093c822be0c/buluwipetilajotalo.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/f8f628448d4c5b2f338fa0046f8cab9d/61720540445.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5ca1451e2284a6e9c5b867f1196339a2/nodejowojiminexag.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/nedivujewixepamirupezesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=epsxe+bios+scph1001.bin+free+downloadPDF 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_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 11172 bytes
SHA-256: 5a8ee18d05bec4324b2bca9122db69d29952497cd9832a149f0d543e7da72e7a
font_02_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 16656 bytes
SHA-256: 42e2e292c9f90e7b51b765b6546272870e244256f7edee9b1d5fcccd6ae1ea9d