Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc9d8f9a5c4ab48…

MALICIOUS

PDF

82.0 KB Created: 2021-07-30 21:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56445bba5f3fe9813b3d8b249b47ab85 SHA-1: 7d7d728aa13ba11a0d0e851a14778befe6309bc3 SHA-256: 8fc9d8f9a5c4ab48ea5b8e21021b989476abc23c15724129ca0c25e302fbb163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://wastran.ru/uplcv?utm_term=lami%27s+theorem+in+hindi PDF link annotation
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a52af009f430c078d5cd08c2af2ead7f/rogiwo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/ff51ad47e3fd14a89dceaae796287016/xixerugonafilalijolibo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/487fa2d960085f5ffd447191a4a739a8/patofizunizujeluraredapel.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/28814515115.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/wivaxe.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160824a0359d39---39632584494.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/26999887e09e0e730a7192e6343a6ff7/15585258301.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aaa2ad419---rimowesitizowilega.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/84519162207.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/4971623637.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5de4447dcb9d0d1cab1aa72d78dc8634/22373556682.pdfIn PDF document text
    • https://mauspro.net/upload/files/21072039317.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8539bdf1631b8d88767253b0a24a06a8/zomedakimewe.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9b85d33962f51794e89c9838d54519cc/resipimisazijibidoni.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/de66d4ff3d108504a22dff78bb06b0f2/646180166.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/20525736649.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/72284190544.pdfIn PDF document text
    • https://p87.hu/files/70422403911.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/51860382783.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/11722333263.pdfIn PDF document text
    • https://digireg.nu/upload/77504572360.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/94026769681.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43f148259---85952249034.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_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 10456 bytes
SHA-256: 02bc16776e04f34c4022cb79e45de12bdf24e4eba183e9918989bb447e18507e
font_01_sfnt_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 18460 bytes
SHA-256: 874f99899a043ee9a63b81e94bafb40d37905c6f74cd9e54dd7df6bcc929c253

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