Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c40095e717e6f2…

MALICIOUS

PDF

92.5 KB Created: 2021-09-02 05:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5e95c9cb82bd1de3c4c2eb8327157a2 SHA-1: 08b952c3c04c69fbe05c1b4c3a3e1bb6e473d784 SHA-256: 32c40095e717e6f2bbf654d6604d105c3a904d1a75c83391b9d61e719e068ff3
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 a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://akapacha.com/userfiles/file/4994507440.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430235020966886.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0571701a08---sajizuvoz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6aa5964091ca09cfcfcfea5988f7ff75/33966848937.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a4ec118d7500a9085ba135d30321d0ad/bipovapobuge.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/sefinizujebo.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/r5unqkgc5rtnabhka4k7k2qhi9/42900364640.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/vuputogudidatukuloxefuka.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/sisowiregusabug.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/tuzivilewitevosoje.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d55d73a555c---fonisidenonanufor.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/rowixiwoniwafedapimi.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062305434273499.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e06a1b6529ce08c42e47d68dbc2d1cd4/95940285301.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2f8354d69692081e1a2a4989edc9e7ab/75467113672.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d57ca554c40---2161040472.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/liziwusip.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e00352031a9477e9c04109036429e35d/zokovejovukavena.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/528c75a9fdee1851dee5bf6a1ad76209/15620138694.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/25403695593.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/73863224477.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2010d381b503825b43b1b1b502ba454a/xitoxov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ripped+in+90+days+workout+planPDF 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_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 18776 bytes
SHA-256: 66f1a469d956eef1790ee6cc47108f4a0a96adec84f325d5704ea596c3b325b7
font_01_sfnt_off000131c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DF 11112 bytes
SHA-256: 04450f8ea3f2c409dc1741ffc731e3adcda4d462f560e6f2722bd859c747d276

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