Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc3f7441c605938…

MALICIOUS

PDF

91.7 KB Created: 2021-09-04 08:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 881389e4ca6b1546769edb0d2a06b0dd SHA-1: 2480b7b0ba648c1fbd899a873ece033579c61e1d SHA-256: 9cc3f7441c605938af822a5b738763669b12f0795ff9a7b76203fa9a64350f1b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The primary function appears to be redirecting users through a network of links, potentially for SEO abuse or to serve malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://baxsporthorses.nl/userfiles/file/3414995848.pdf In PDF document text
    • https://smilepaper.tw/archive/upload/files/10632373008.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/0hi5kicdsva6srcca5416ja68g/wuwoxabekirodiw.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/rupafetowisefovatib.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/fanorag.pdfIn PDF document text
    • https://netpage.info/userfiles/file/25833491886.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/reditibutejonakijitoli.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964bb12f8bc---87238650043.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/4979857138.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/64f715fcf397d485b682588255dcb617/kevuse.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d404e017a91---tadukuzij.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/60904578708.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/odfe8idrbjqbfvuqbrr8o6n6g7/24154331340.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/redatilidixafululixukuw.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210824133205.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/65214577380.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/difibiguf.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/80573971489.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c38aa653e70---lesikovodagelefaxenajadib.pdfIn PDF document text
    • https://ivanamihic.com//files/xafagitodevupedabodo.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/palukiwito.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/1b1afd0ab8fa501c5856826fdae01751/91571158004.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/r1m7kbbu51hn80frc3v11v6ijf/xekifasud.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948d06296e3---68744972308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=freakishly+effective+social+media+pdfPDF 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_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 17760 bytes
SHA-256: 4a1cf71869aebdd064b9a653383c95358d7ef200ca09f9a5d5e20ccd1c6bca2a
font_01_sfnt_off00012eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEE 11032 bytes
SHA-256: e206df1d3b5961ea6597129642108e4ac3a7981614d7eead7314ac6cf5931451
font_02_sfnt_off000148a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1