Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a07fc4fb80aafb1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 19:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9536617c3ce9b69a98e11a135b3b160c SHA-1: 1fef6452fe543b33d67a8ca9983f22fa22ee6487 SHA-256: 3a07fc4fb80aafb1563dc9657da84ee98be6dd40df1533280d73690d6edf7578
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially unsafe external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/48554687610.pdf In PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/pafugorol.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/xiwagakekirekulatosu.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/095d5d1349d3f9c5c90fdd0c197f49c1/sumuzunerunefedegudireda.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7fc5e1b1f972332e86d5071fe42230fe/wakigugurefifog.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6940e30d---71093171874.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8637216727.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd16e661dd---17667634828.pdfIn PDF document text
    • https://cecprint.com/images/file/larenorudumaxevog.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/615rvrdrab3qtqj5pu36ithlg1/gesugarevarepeniluwib.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8732e40b86---72447427235.pdfIn PDF document text
    • https://t2sc.me/userfiles/fobidugamujixelugikititu.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/pimomigewejireluwimalelu.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/71890090914.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/30202411311.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/genebezatudogod.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/74708979675.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/79923596109.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/mizelilafetefufukuv.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/88739178519.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/20078316927.pdfIn PDF document text
    • https://cape-electronics.com/media/file/21885206305.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/68818980635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=electro+harmonix+voice+box+manualPDF 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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 10720 bytes
SHA-256: 20fed980e11211ec58c52f5412d22f1d26a6922802a0d0a0059b27b616297ef1
font_02_sfnt_off00011068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 19024 bytes
SHA-256: 893b82150e4db17585c8818168450cc24e87cb462f6975f8cb057d6f76bc2faa

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