Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5436367b9d70898…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 23:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee26b7754e9ff5039f2ce73d9d7d33e1 SHA-1: c12677ed9afe7bf11c6b38dcf4d9e3fd68f2fc14 SHA-256: c5436367b9d708987993e320e0a8152737246aaf1fa92c0e3a2b4e1f43d781ed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly suggests malicious intent. The primary attack pattern involves luring users through a malicious attachment to a site hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://humanitool.ru/userfiles/file/90153168448.pdf In PDF document text
    • http://historia-bfured.hu/userfiles/file/78481361741.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/57079688636.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/suzodugugebawi.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/jufukodabevewobimamibafe.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d0bf6865e---saxukifuguko.pdfIn PDF document text
    • http://teakdeck.pl/files/file/1129780629.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f680c7be68---41244260924.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a20ec69f177---lezizi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/37b9fb2240262cdfd663d4ce02ae4b64/dopikerokutitezake.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5561_20210809181217.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/66732039801.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/82338119558.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/83010047610.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ecc626096---riditewakubonujafivedose.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kujokugulirorotejure.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/guduvelanirurejoke.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ca6a33887f6177f30f2aeac6858b3cd9/50212449523.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210714_45B089D4BB3ADCF6.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/10041628942.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/89626712043.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2eb5a0fc4312049f23f5cf7db3abff64/ronawasuzaxepa.pdfIn PDF document text
    • https://netpage.info/userfiles/file/99893485929.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/82736767626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tenses+in+spanish+worksheetsPDF 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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 18948 bytes
SHA-256: e7ae5bfd2cf5fa05cdf9469842cc5fe9ab2de2d2211df0a2632f12d6aa909c0d
font_01_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 10444 bytes
SHA-256: abfe6d6e7aec13b6322e77b31337ce0ef82a4db144db8432d165ef2ad996b239

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