Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db95cdd54fbf350…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 05:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05b77527ea4b3f1a2d56c05fd872f2d9 SHA-1: 4767a45949c1cda923f64c72ca86a777068d451f SHA-256: 8db95cdd54fbf350759fe2f38c7ac7a7f55552e94520aa28e70b1776e5bb137e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a separate password-protected file, a common tactic to evade initial security analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=bus+simulator+ppsspp+download PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cebd373cbc8cb67464ffd73095a2272a/1411399578.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134632cabaed---16510572443.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/37457773332.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/feac9014b303867eedb2827b79a0b044/23117038502.pdfIn PDF document text
    • http://freestyler.cz/img/file/ruwojixunokatiw.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/tijopez.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/12608406371.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/23514399172.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219915971250.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/78835375436.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/64844272366.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/29722171696.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e897dd266d---badizelexenapaxetofez.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/97773444538.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2f70ea9a826c82f7323124913b1aae8e/tixafuvilevona.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/42792391655.pdfIn PDF document text
    • http://dgkno.cn/upload/1161622574.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/jinagudojagusugabol.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/wakujaripokimo.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/volaluriwatagogusij.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/duximawolixanimimilutav.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/xeditekonobuguxakexa.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/7609059730.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/26508277567.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/rijifamekaxowujelavixe.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_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 10660 bytes
SHA-256: efd03912bb0f2ed52f824b8b86557c70003cb531552c2689f349c239723f89e9
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 17920 bytes
SHA-256: cffcf0e5a43de27e4797effc446173571a798b579cfbc3f186163f9c8119df17

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