Malicious PDF — malware analysis report

Static analysis result for SHA-256 032dd447d3248f60…

MALICIOUS

PDF

78.8 KB Created: 2021-08-02 05:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9f5de68552134b15eefb7fb3de31b49f SHA-1: de16c45969714dfdd78fc16b0d5f6020d04ecff8 SHA-256: 032dd447d3248f608b688608f6823e83db2d04d7277db41684037d29e2bc5859
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no clear textual lure but reinforcing the malicious nature through its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chineseclothingonline.net/File/bigusunexizibe.pdf In PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/91318123559.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c429bc16da6---jajonorofomedagu.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/64227704219.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ba387e4338277b1b77baa7d39a3b146e/76282090770.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/722b3fcca078e3d431c7e26fad9e8cb1/92888137748.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/kutarowemasabojuxatufudo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/82571743500.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/45895385427.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/livavexizoviwi.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/fawiwigamufata.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf66f083f8---wukunasu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/r62de87anr6topsbsmdqkh8556/toliju.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/80305086156.pdfIn PDF document text
    • https://tajeer.co/userfiles/file/mobufipujo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/96979628538.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0eb2f7ea484dc220c5b867b60ae78149/39915543576.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/vuxavijepupiduvefi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a2e018128---xejexutolojopidiputireno.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d70eb451b0000b3c453c1d0ec5a2e76f/dufanebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=athlean+x+max+size+redditPDF 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_off0000d135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 16432 bytes
SHA-256: 2189f921690342fbbdf53205c372ccf9e872c011b3028226257634ddb9a4da99
font_02_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 10536 bytes
SHA-256: f8ec2de2d19f92d34cb279b2350068286cd3c7447a2090c120ec88403de890f5

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