Malicious PDF — malware analysis report

Static analysis result for SHA-256 75991661d0a7fb8f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 11:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 697c4af0547bb4c6ec53698fc4782680 SHA-1: 4dbd193fa1802ff89b00a387d6d9257b662ef2ff SHA-256: 75991661d0a7fb8f0f952fb35bfe55ce87f6d59dc0acc79c873246f2fe6d248e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fred-robin.com/ckfinder/userfiles/files/pipejakebose.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c9e84a5767c5e16d3dea0624eb253016/wizakujex.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc8cf18a1---52798592497.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/javuxave.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e6a174918---92429057963.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/buduwakobivaviwaxevar.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/76121795125.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0a3bc1598b40d6d50fd1cb2cca480178/xomatolovu.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/53905745008.pdfIn PDF document text
    • http://hondaototananlongan.com/upload/files/40893281505.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/87439129595.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/97328493b2c0a7663adaef04a836f8b7/56095891698.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/b5j687k4m7svkefs8ru62r843p/74762186115.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/57263591040.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5258407f80---xepiwusuzilovom.pdfIn PDF document text
    • http://mobilenmr.com/files/files/86449158114.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add21be4b7a---54898295592.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/75825443115.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/70722890410.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/nibajavokixojisenobame.pdfIn PDF document text
    • http://alkanboya.com/files/file///48158255561.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/16165002731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dewatering+process+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_off0000d06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 10836 bytes
SHA-256: 3fc078494c452baeebbedd19fab510af5b71feaf879505076e8e01250c57e7fd
font_02_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 16884 bytes
SHA-256: 0b18a7f94e8917ad9b126b1e63e0106e50def7539d987a434ab17af4154863b1

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