Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13070b0d4f23a86…

MALICIOUS

PDF

86.6 KB Created: 2021-08-24 01:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24c5eefa2f3ecebeb1765cdf84d3ef50 SHA-1: 81e08d3aa499b02dfd94f666afd2016e4c74d6cd SHA-256: e13070b0d4f23a860dbe2807887601eefd942d30998a2f87040cf608c249d2df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment, where the document itself is the lure. No scripts were extracted, but the link farm structure is a common tactic for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=stupid+things+to+do+with+friends PDF link annotation
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f28b4b041e7dabf79c438fbc8e13ee87/jezizuka.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6b8c0010d83f48ab556bdcc8130c317a/sukevoxusezew.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/99483988207.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/82558365802.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/28337125341.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/10694873378.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/21076922155.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/23779086258.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210608144600.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612178facdd7d---40359852990.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c29413d9---47357001335.pdfIn PDF document text
    • http://zuche0551.com/upload/file/nuxen.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093769fefe33---97191526984.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd01303077---93588601928.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/94814004576.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb155167b9---20875439119.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/vibineruvajokevikunimowug.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210707104835.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/84198672147.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/gudenikapotowipela.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160838ac8a7e4b---95323087468.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943db791f8f---rikenegu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cf37aaac8b025313fe95639e34a656d5/pamasonagofitevomokodud.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/xamomovo.pdfIn PDF document text
    • https://etimes.mn/uploads/files/debirawepisabedotamagixe.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_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 17452 bytes
SHA-256: 5fab0716e12df962651cc8d7d6b4a7e353a75a136d1ceef9689900e85d6d1bbd
font_01_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316A 10828 bytes
SHA-256: 75fa4068758753041c2e93c5d656636f24f369ebc31087f869819c879063345a

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