Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9da7475646b558…

MALICIOUS

PDF

142.4 KB Created: 2021-09-06 18:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b37cea071e618421a2881e511748f045 SHA-1: 6f2dcfcc2db1906891a5494d4f69b4b7a9a885cb SHA-256: df9da7475646b55861066693a29f0904502da248755c50139a51b88ac185d243
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains. The PDF also contains external URIs, suggesting it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://tai-yang.tw/taiyang/upload/file/41826314603.pdf In PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/devawup.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/tiwisunimizuviremumox.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7ajpk3400kus3kcb0geldlmkkq/kugajaxiw.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/72388649648.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/jogik.pdfIn PDF document text
    • http://gensugroup.com/upload/files/nematoxabe.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/jepuvejepawifasirib.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/nemimibepofuzelebivawikom.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210729_145759.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/515ebbf6d2fa3f6f6838e76a69e1e692/77776294677.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/81018604306.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/15411421396.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c929cda832c---6167749680.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160858f2d21bd7---dekowud.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/7712126901.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/eb21fb493e8ffdd5be91646ec032bab9/donuwiz.pdfIn PDF document text
    • http://planetamama.ru/files/file/pojipixa.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e303b80dca---91779949714.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/84329416095.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/df0bbacde62abf1d89293057ad342ada/vemiteposuxap.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9410dd9a31---pixujuzixamuma.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/e6ll79acjiev3thgptpfk8goml/22749177880.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/67a3a12041c49ab4242ab5d9d943e092/ligakefakaxesali.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/nonifudagipim.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/befawoveno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=solution+focused+brief+therapy+treatment+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_off0001bcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCDF 23056 bytes
SHA-256: 85b1ae5a601168fa1fa1c45c02448d09caac06c5423159d0d44b30bef639f623
font_01_sfnt_off0001f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21052 11312 bytes
SHA-256: f56c171f29966cfada096b9a02a5eb7470c1be39ca865cf607b41610cb99fa2e

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