Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc6c40f81803c0b…

MALICIOUS

PDF

75.5 KB Created: 2021-08-20 22:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2320ac1b12ebb73a374149ab279c5c20 SHA-1: a815df9570efa3c97565731218f45d5bcb619672 SHA-256: adc6c40f81803c0b30da4819d72ec3cdcc647ef9e8c22fca5970cb7f5cbfb1ea
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aed58b72de---tabakopobuvuvirewiwonud.pdf In PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210507032248.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc01d0127---83912879616.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/lobagalilipomunabalono.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/280533197736.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/hou5btj0lr3jm4es1v1ji52h70/65594638974.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/n1jpcq0mldlnbgm3lcdfeq8fg7/4471369190.pdfIn PDF document text
    • http://mldinsaat.com/image/files/21852379164.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/12339760168.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c084e635410---68212916173.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/salilusetujizebuximojedu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610de53e9c616---44237046557.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/97818793780.pdfIn PDF document text
    • https://razredna-nastava.net/files/39441918042.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/fetunev.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/remamafuvibuxubedared.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ab050f9bfb5---sarunamibub.pdfIn PDF document text
    • https://energooptima.hu/upload/File/79440097493.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1c91e0cbe90b2c1067d3e293263d404d/80808232378.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/60065786647.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/zerosuwufiwujenunutep.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/n1vih59mr4ask9f0nn6j057105/wogubujupipo.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/rexitajepavizoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=neutralization+reaction+worksheetPDF 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_off0000c017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 18604 bytes
SHA-256: 95f3eee6f228269933357edbcfd9faa954dd8513800be78c916dd9e7b25e93e5
font_02_sfnt_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 10644 bytes
SHA-256: c5f1c4b3f17853485e203b6d00ce1807aa86312a35c2ff5a2644b2a9a1eddf0f

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