Malicious PDF — malware analysis report

Static analysis result for SHA-256 307618ccbd08e3ed…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 12:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 422b262c43d1684adcb27e470283edf5 SHA-1: b252285039577cdaa28bc1e2fc0c7cee70550bee SHA-256: 307618ccbd08e3ed0be425ef99c8044efaab96f976e2b18457bc0348fa81643c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it is used as a lure for phishing or to distribute further malware. The PDF structure and embedded links are consistent with a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://smidgel.ru/uplcv?utm_term=decline+plank+with+foot+touch PDF link annotation
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0dc1b4f54---41619038082.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/54086414553.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/masgm3kimledumjpnlm0h3jnkg/takagaxaginijikibajekoveg.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf3144879e---75224782780.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e934d14a92---25219193947.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0d01fafd3fa64b20c4aae39190c8e350/ledowid.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/57239519346.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e06b453f8---2849472311.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/82188342619.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d42e1391e8f5c6b2a518f12b4aa88f61/puwupowaruwewotavobuj.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/gasivepejazixutusupiroziw.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210707210423.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdab90ae2d---ruregulijar.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c023a7112---sofigafexofeb.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f68cecc7015---xasavugemunuxogalobita.pdfIn PDF document text
    • https://mfdesign.hu/files/file/12632418399.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1668387ca5c3f28c1e6497062ce2119a/bafapobiziribedefedax.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/59668373785.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bed1d164f8---xigeb.pdfIn PDF document text
    • https://orrizon.ru/images/file/buwedov.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/bokuvijaf.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/38028205010.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_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 16936 bytes
SHA-256: c50b5a6454f10ff7c52a5b3f8ea4f37194c3d15e3b15ca1c050df990ed4575e9
font_01_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 10588 bytes
SHA-256: 9b5190cb9de6cc1cb6719ba4a446c7b49bad3ec7b5caae0c79a6cf59b1c4e691
font_02_sfnt_off000126fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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