Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e0025d9d7aaaf2…

MALICIOUS

PDF

71.5 KB Created: 2021-07-15 14:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cf0c8064bcd371cc8306e00b2fbf3884 SHA-1: 346a0a1ba41d3b7575df2174878c6083e5032316 SHA-256: 82e0025d9d7aaaf29303cc964c1235463525155ec70335ecaaace6b53e98dcc8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'super-forms' plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of a 'utm_term' parameter in one URL suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/a8d1qqsr3ggacpohu21kdggra4/36567468221.pdf In PDF document text
    • http://www.specemc.ru/upload/files/laxunujesuvo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/u6ano3h4uhiv03fql3hp5rd271/jezarabijifek.pdfIn PDF document text
    • http://banquat.com/userfiles/files/gunowiv.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/sluek77q8o9s2ba4neukh65j5k/51231556826.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f641866d0c3e1e3a1e8eaa1a0152b696/tisexaxaruzomozenadumok.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80a82052d---mazizokitu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b2b395efbcc7802285d032bd7e1dafca/78497864669.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/95562585117.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e5cd9ef23128310f6fa86a97205ab404/dejeguruvowixexuwobupov.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607caae3ea6bf---52890176421.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b28caad71---10112871659.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/xobezugilagosi.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1b76399d52cb8af576a4fd913a0a5013/62651066127.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160827e1eadaf9---xuwamapufu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3ndm6icbdvcnmgm6u6vl9tiilo/vesekifadoredarafuwid.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608421d77d878---95439484238.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/71468859670.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/357cf03d2443fdf7254f51a250666e29/jidumafepokipor.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/f1e8dfa566608fce87d968d975206dd1/8296949894.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/pobogepixave.pdfIn PDF document text
    • https://zhansq.cn/upload/file/31781596915.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/42db44727609512e78a3daa66da8e7ef/jobasiga.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607165bbf1956---sonemowenumumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=convert+file+from+jpeg+to+pdf+freePDF 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_off0000ba09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA09 14968 bytes
SHA-256: 5e594f20ded777b25eb80089e65cf44b955b9ea94f974e4a2be189820b89f8d7
font_01_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 10736 bytes
SHA-256: a43ce941022c2761f34293952497570eb5dba3f590ab7bcdea346809c1ceb7b0

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