Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b756e8e28caeff…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 11:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e4969425d8e56b93feab554fc03d22b SHA-1: 386cae06f953178bb0d8890bf5d6b55eb68cdced SHA-256: f0b756e8e28caeff62cb8163453a16c65e39ecb862fc9cae1b382a0a0f58aa47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334131120fa---869979470.pdf In PDF document text
    • https://interativacorretora.com/fotosempresa/files/36153607250.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mokfeh0v4gs16jqp5npm47r83e/87274063422.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/telun.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/gefovadunugowonones.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/laselusumuraturaboseje.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210904061339.pdfIn PDF document text
    • http://didula.com/img/file/83955404319.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/xikerasuxe.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/50350862350.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed70ec736c---jotaxukokunun.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/47844517974.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/turivov.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/kexatadibetutobisa.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/53205125494.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/tefaxurobo.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ad3807b86489434404ef80777516c73b/zabuza.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/xufufetipupibuzijogabaru.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613512082f175---zarekogenuma.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/jexumunipotivefefujumu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2cf8680a---23258501694.pdfIn PDF document text
    • http://offerparts.com/upload/files/35936731341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+cast+of+the+wedding+crashersPDF 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_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 18652 bytes
SHA-256: 4bc54fd18990a93440ce04c8db9cc8249460ad2775e7786dd52228ef029550e2
font_02_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 10756 bytes
SHA-256: 5318f93ecaefb074d687b72b98bbf5a93abc8119788608775bddfeb6acea1e06

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