Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96c65dda5cb6f53…

MALICIOUS

PDF

75.2 KB Created: 2021-08-30 20:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f92ce2943788855aa82ec0bf8b32838 SHA-1: 2c56edef1bfc972ca3b1a61a6e7082beb325d00c SHA-256: c96c65dda5cb6f533a1b51aea569f09c663cc17ac400b543a9c5a0edafe9fdb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aivieksteslaivas.lv/userfiles/file/duvaxajosovapewodebofatew.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072c89ae010b---99574977572.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/tujufitaj.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/svd20ujkg8tnbau68q928u0890/lagagefulubupofapufexuw.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700fdc9d27f---mutifuwuv.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b54b235f91a437d3c7f72d2726890e45/84784507560.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4be902af4---wulosefibozowajizukiligif.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608292e4af58d---10198854923.pdfIn PDF document text
    • http://come2menorca.com/images/file/35654531222.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/75541226519.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/toxuzew.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/63833987098.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160821bacd3e86---murigebakupi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/gufit.pdfIn PDF document text
    • http://www.moyekolodin.com/files/66801969544.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/76917993295.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0d831e7a24772d679d315f8a189281b5/keseg.pdfIn PDF document text
    • http://infunplastic.com/d/files/zamarezolidiruvepumi.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/17530397827.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c6e9e3433---wozizixemiwa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36cf00fb3---monepibojuvegilexavuba.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f53419aa---46837953617.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/27656231593.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/41441352490.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210724_B2CC4A844731885C.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+conduit+in+minecraftPDF 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_off0000c02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 10692 bytes
SHA-256: 186f1b752ebc819c3dd8b73899dc75213e11a3e12d479dba72c0f1c283c3dcb5
font_02_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 17788 bytes
SHA-256: 7b52e3b7c108162055dcfb83d3d9916b2cbb58dcedcedb5c938191155373c49f

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