Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0ccb6e3f97912d…

MALICIOUS

PDF

87.9 KB Created: 2021-09-05 22:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d22959041d204dc5a82796eb047eb21a SHA-1: 6d27ad5bd4b4a44ee8d25bdebba6ff4b6ad94647 SHA-256: 1e0ccb6e3f97912ddcbcb24a8413336203a51adc1aca0ab4687ff800db11c0b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious content or phishing sites. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=citizenship+test+questions+2019+pdf PDF link annotation
    • http://zerosquareonline.com/file/tutopufikitadula.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/jovexalinomuwajigexup.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a4b41a157ef8130bc94cbe48e966fd42/tepawijezemesapoxefe.pdfIn PDF document text
    • http://clarasonic.com/upload/file/8194912230.pdfIn PDF document text
    • http://fotossc.pl/_files/file/bopejoxagusijusixeroxebe.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/15266905181.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/dadar.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/57926924112.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/573876150f109aadef7fbd3fc3213a96/10575397806.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c81c9af8a---87990047230.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/valam.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f288315dd---ledigulinawewanevixinoruw.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/wulifuxoxajuvozufek.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/91434443732.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1e14c57fd8c6c5d9f2ba2690faf97e59/xavobugawe.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c70e289f6c2---fojuluxeru.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/38373873525.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/jeselexajenupaf.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a204844d86---goxomewaziboli.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/fipitugugekepe.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/59979276223.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/tugubeji.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6202b125d---valedudazowibo.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e11708f0b0e16a7e8ff8b23e50550d75/22282282181.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae1b7a67b---16303293937.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/gotevitigotixevagedug.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 11088 bytes
SHA-256: 135f1f1259608c276b6e0bbfbde45690c8d77e982e13e76d350e3719fa6ab246
font_01_sfnt_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 17184 bytes
SHA-256: f2eeb8150b7af6684f824a15e6c2c0e155f566d0507f24c6530d19cc130aeca6
font_02_sfnt_off00013996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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