Malicious PDF — malware analysis report

Static analysis result for SHA-256 1940888a16a33af1…

MALICIOUS

PDF

87.0 KB Created: 2021-08-11 05:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7ec1301c4ea934183a533f6fa6d7a42 SHA-1: ddb583094d9ca60b2fc99994f679602c485d2fd9 SHA-256: 1940888a16a33af1acac5c0b4f55a528324a1241e44dc7b724ef24bcbca71540
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The document body was unreadable, but the heuristics strongly indicate a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74397e387d---37195584114.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2ed327f7c6f7ed0f1f20571fc442bf34/mikadezedag.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/3907704251.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/12227927953.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c2dc51cbf---6337641169.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/25394279466.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/bupoderigelelefepisuli.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3f59bde00880061dbf9d1c0fcd78d8ec/56201852628.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/94750941648.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3833a4b2---gimupisajusubavizexif.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9973012fc6---89102263063.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/43bb80a9528ec9c2896dade4d3cb6dd8/903662306.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/ligajibalijisatukovosojis.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/jolakirezatuvov.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/31395218650.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e21ab285d---wevokovezaxagobezisa.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/91546429459.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e62fa996a5830da7d23d8f2e69462e96/49849979610.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4e76e6ef09876d19a858695928a69d3c/riwomisopobutavomosadan.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/jabuwajejolu.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/8330733761.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/o4hsbqt20bauia347dmraun5c6/18311451073.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/zopenukol.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1d7a3fd88a5e12a2387a79b13d895e33/deromeroruzosepivorof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=are+anjou+essential+oils+good+qualityPDF 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_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 10896 bytes
SHA-256: fd028fe16017344bf55723bdfab6c491774c71aef202f3904ed13b18bf856b6c
font_01_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 16528 bytes
SHA-256: 943ed6be5a85f28b691a8a271fabd645a006060c765d62280a07fd2fd8115070
font_02_sfnt_off0001363b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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