Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3971dda8186bcd…

MALICIOUS

PDF

87.6 KB Created: 2021-08-08 23:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9b3b8791590e8dd8093a5b7ae1d14b2d SHA-1: 6269a3a42166b7e7fd71a2f49a6bb6b95bfe143a SHA-256: bb3971dda8186bcda70bcd2c22798e5c2be425f3c77961931111405715f72e0b
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is used as a lure, likely for phishing or to distribute further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://radmangroup-ye.com/rgfiles/file/33503308968.pdf In PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/wizoxulu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2ae557e1---zisale.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ea428e830456b6a315bbe4719f045f33/bedakuratiwane.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/89596886958.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/lobuvewalejon.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be000bbd2fa---68413716222.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1480a9bd5aa724189a7cf1446cbe41df/85136893048.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a6173077d1cee8180a779ec7a2bcbfdf/68677074842.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/21012019164.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ee8d1c2f7e2057cb61b4e9519a687bc7/73934457668.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/38575820263.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073563166bee---rimoxuxopexepisuraguvo.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/14e1e401e832952bea35ae24c1830f64/guxirek.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/697261529e4e76bde23c4bd6a4885b62/90835983852.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f4450d00a---tanupena.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ifac237nisvf1f8qspg3oke5st/sitaxunovewilisa.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/jokatasinusutukefe.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/sozetulodepivavuk.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf6f8c71a---7912328388.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/darebadigukug.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8sgola38e4uheukhcq73cpr13k/sixebabejisasozowiko.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/nuberezove.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/wanejupetabune.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac920e8750---xitagamuronupuresa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=she+stoops+to+conquer+summary+slidesharePDF 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_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 11216 bytes
SHA-256: 88b554b38c817d59595f6b6dc1ddab8534f82daf214dfb776b40ed49a9598227
font_02_sfnt_off000125bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BF 16592 bytes
SHA-256: 29cc7b6ade84b7efe29bdb191232c3e3725fed68f3e4459afbc497ab31ff9869

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