Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5857d6c2439d3d1…

MALICIOUS

PDF

90.1 KB Created: 2021-07-23 12:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42d7c45b5c68a9af6165b2f078fe805a SHA-1: 9108e374308e0da8c324f7f37d0158abb61960cc SHA-256: a5857d6c2439d3d13b030a3535342e46ad06e376615d4e754bf480bfe115a67c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The presence of numerous unknown URLs indicates a phishing or credential harvesting attempt, likely disguised as a document download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6ce15936---dotabobamotiludukimusevor.pdf In PDF document text
    • https://thepainter.asia/upload/files/26159324803.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a84485212a6---zikefodewi.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/8a36kl7sarj3ba1n2pb3v2i847/mojimi.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/jamafular.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c0e88e385---40302450571.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/kumegemupotoxane.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4422cd1f4---berezafonufibi.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/tomoxezumaxakamavuro.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/wugazozomata.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0411ba0e1---98780857870.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/vakaxel.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f48183d9213---bobuzokazaxajixa.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f50693d8c00---dexorodovo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4458c485d9c4ca21c866ee0e328b6a61/64563141462.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1f0c35544e300f6397a915e795c31192/77047327912.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/6jsffesbqiclfduskmmlkekl4r/rixubabebameduvanejoxi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf01704aab---xetunukiguveliz.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ca7c79a9c3095a64ae623e8468b7e514/86803460065.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/159715074.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e66f56340---81784311491.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/gafozenoxezanugubuxe.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a649b4fee491c6b46db0436ec1084caf/71429774159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=centroid+of+an+objectPDF 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_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 17900 bytes
SHA-256: 6a833aed4d424ad1bb0722721be70510a9af727a4a44a44d99315ad728724d4d
font_01_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 10556 bytes
SHA-256: 0008c0723dc4b411618527df3767ae773549aaad1bfb9d7b648fc4dcccba553f
font_02_sfnt_off0001402a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1