Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec995966a61ac98…

MALICIOUS

PDF

88.9 KB Created: 2021-09-13 06:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0bdd8893515b3d4d8e76baf1bdf7e343 SHA-1: a9f3f0d82f3fac2d3fc464f81d9c47ec6481c015 SHA-256: eec995966a61ac98217121c2be46c9205f4aca161a516ca818f56125c59bed83
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on compromised CMS uploads and disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these are likely used for SEO poisoning or phishing campaigns. ClamAV detection and ML classification confirm the malicious nature of the file, suggesting it's a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://medvor.ru/uplcv?utm_term=iphone+garageband+for+android PDF link annotation
    • http://makeyourpartnermelt.com/userfiles/file/47997881635.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/80346219437.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/fibemum.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03386078e---88623697918.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/vigisibura.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/xenogaf.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuruzomitakulugede.pdfIn PDF document text
    • https://unosms.us/userfiles/file/zegimotoxajizojuliwiz.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/watiwej.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/71924554586.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/mebaludejuwasudapuj.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/32938607782.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109110400239886.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/nazuwibedejupuw.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210901095558.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/77627995084.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/b01194e911cea85700a5e4a127f683e4/40448322435.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161362fb7aaba0---90448268446.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16306147241631.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e588d149a8020e5d43d9a25c3d9fb59b/52033055862.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/wigupememegivetileditik.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/jesetozajigozerefo.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/sokegunemujisexuxonepuwed.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/45029171035.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/kazaxajazepiguf.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/potamalatev.pdfIn PDF document text
    • http://fructusartis.com/i/File/pupaxuvuvebuxarekuxojeto.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 16588 bytes
SHA-256: 98d92eb356faf41d8681b54b806e152313c81e6b17beb38986c28607f94a9381
font_01_sfnt_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 10556 bytes
SHA-256: 86ef64fb313f8620fa3e3b926d1c845435f8a23245120a9d1038f47f1c167e41
font_03_sfnt_off00011724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 25212 bytes
SHA-256: f70cd3ec87d5b0dc080199d84b24ef0ab9cb56b62ad1692ca1082cf26860059a

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