Malicious PDF — malware analysis report

Static analysis result for SHA-256 57af9c93e77f33ed…

MALICIOUS

PDF

101.5 KB Created: 2021-07-06 21:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3be365d10267291b59d81c4a913bcea1 SHA-1: 953e41ad022dcc8472e5c9266f538dc5d90e3ee2 SHA-256: 57af9c93e77f33edd6c6a1b2957c1147c479df656df5b47e19574415190e765e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including one pointing to 'smidgel.ru' with a 'cost+of+living+in+tunisia' UTM term, suggests a phishing or credential harvesting attempt, or potentially a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=cost+of+living+in+tunisia PDF link annotation
    • http://cw-cut.com/uploads/file/34059386560.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d8ddc062f---wenovipumejuwin.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ufcj46lkcpvdd692cgn2kpmgs4/bopewegakajawe.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c90986ab---26402283186.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/14321272261.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/271lup5hv0pllft2ojhrbl1j20/xefizuzesibenisaz.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/79449109319.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c387260de---51386723072.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e1dcc6505355692894060a980d42b97f/23063748134.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/43309555475.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98d3060410f63f74a27f5f09c8b96ce7/najupux.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c94c0a29b05---99856408297.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b737b5bb6---mulanaxamutazuta.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/59136761014.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f5c81f208e5c47208830af96b22b65f7/tepujevakigedoxazimiju.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc5a04936---9230338993.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/jo3kmdbiu0m40gfd8d4kiuo1tt/xotarozagereda.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/78888771045.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacffcc9e29---15160183620.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/kerowalelu.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/kabilobavigaw.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887640554b7---94653369943.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160756b4f247b3---10645900097.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/71358414265.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085c01fe04fc---271179132.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 17948 bytes
SHA-256: 1b8d2c2e6ffac66799d9e27d8c0202d4df013f28aca420e0b1db7f36d418f7bd
font_01_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 10356 bytes
SHA-256: a22de77eda67d845a016521b5d3a3e9014acbbc5d32bf535103e6dd96d2b62c6
font_02_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001441b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441B 1764 bytes
SHA-256: 25f153bab7c6b441bf0af0828d3e3272340631574bb0ddf5121e9364682dc2c3
font_04_sfnt_off00014c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C70 21904 bytes
SHA-256: 1b765464d1f6ce0f6291b8b80e6854543b03e8c037281a3a87d2954614e67ac6

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