Malicious PDF — malware analysis report

Static analysis result for SHA-256 694b503e1e6c83be…

MALICIOUS

PDF

77.3 KB Created: 2021-08-28 04:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 145e51571f556c28dae59432ac9acb5c SHA-1: a78b0e1fd395270b130094e7351c91bd36676924 SHA-256: 694b503e1e6c83be3c1458149bd6a12ab6c88cd5781ff70845515644e5aca663
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple websites, some of which appear to be compromised CMS uploads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic 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 0.9980

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
  • 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.
  • 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://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/55689212825.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/grmllbf71t897m670iqf0fu4br/rifizovikitepinodezixinop.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/65049331280.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/66882059507.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f50979eb---soxaxuzosuga.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/mozusaxesezitu.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/97199690570.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/wopadowe.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/27507754427.pdfIn PDF document text
    • http://exosushi.com/uploads/files/kumexamu.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/iu2f9s6igc482mhdfbaebfp9v3/gozel.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/dezeposofajirujuzi.pdfIn PDF document text
    • http://solac.nl/app/webroot/files/userfiles/files/mixotarigagi.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021080422235673499.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/zezijifigumafogukezeduzi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa38690fad4aa290acaf9116f32180f5/turukimajobeku.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/47cd96cc434dfefdecc7e7942c6a362e/71096923693.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/29764ba4caffd76329c710bc21fe0d14/zifenirevakamenaturakoti.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/xemelamezi.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/sanojifujapajatefabez.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/osecgm0fvbcgrv3ekefbpeuj3o/besukalelozezufoboloreg.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/kuxutoberapevanaxaxumoka.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/zulifuvebet.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0nv9ujtglej7lmnf1uscm72tj1/92154628357.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/38321994422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=second+appellate+districtPDF 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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 10580 bytes
SHA-256: 70b9e309244fd2273ec7fbe5a2d9f5581dddd466ae32a82a0464a774283aaf0c
font_01_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 15660 bytes
SHA-256: 6a2c56562f52cca9ed5d2a25ab59cc69b1432ff7886559bb53f7d48c87cdc98a
font_02_sfnt_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1