Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d15ec09b515a4f…

MALICIOUS

PDF

77.7 KB Created: 2021-07-14 04:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 87dfe60abee3d9c9ca3039464da80a37 SHA-1: cc25c227e4f6efeb7a5f971e59b40429e02a9955 SHA-256: e6d15ec09b515a4fae074ae6b453f7b2efca7ae54d8a1afd27d6d5abb6a920a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, which is a common tactic for phishing or malware distribution. The presence of numerous distinct hosts and disposable hosting suggests an effort to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://morethancars.nl/uploads/edytor/file/79712652946.pdf In PDF document text
    • http://diversecityuk.com/userfiles/file/8638993274.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/b50bfe75335cbf68f31398ab19d31776/61581068379.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaadcbe76e---15854347315.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/74134202447.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/05964622fea2365fbae7f4d10af112d3/sajunivola.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083844f763d8---xevuz.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cce2c38f---vuzomelelelizonemuviwuk.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/fb23c4bcd5a9fe1cb3c35ba54fdaa872/75487660809.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607420c3066ec---mapesajezanubewuxex.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/tefowubidipewixox.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/mupolavelox.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8d50e36bc---69506391202.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/bepelenijikofuduz.pdfIn PDF document text
    • http://chamdure.com/DATA/files/jidegaparalegiwopuvi.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/n2iiovojin7p3gf97j6g27jf5a/dokomasexasomevosonuvi.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/fexidizek.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/nikuzixidakapibopinop.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f83b8ce9c7024b756d0aa38e1182a3a0/63365282360.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1iocn9h2v2jqq6l0tf9fa95qjn/lubiwosojevivejowipibojuf.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dubevikitulilopil.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/kivok.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/kdpm5adlkinv55r5rlnqfttftm/sejax.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609005f12895a---potugofaso.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/xavevede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=c+program+to+calculate+gross+salaryPDF 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_off0000cb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 17136 bytes
SHA-256: e276542bc6a7a252b7b71c3fcc1eff6aa31ebbfd2b9413f2ef1eac43563f647f
font_02_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 10768 bytes
SHA-256: 52fa62258f2782d6efa2fe06ca1e41adf6ddce246498eea56626eb8107588eba

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