Malicious PDF — malware analysis report

Static analysis result for SHA-256 572d6b85bdbd0db7…

MALICIOUS

PDF

164.6 KB Created: 2021-06-27 13:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50e33ba5c8679c515ff46ca6ce450c4e SHA-1: 81cd3ea1e5791405faf6ad46d42b99a1e42b6859 SHA-256: 572d6b85bdbd0db74718881533211d9960718f09ea3ea165cc0b152ce1e74406
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd328caef5---3555136059.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/19717263989.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/cf3807fed62d947b5cdb2c4727267ca2/jififi.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160914ac0e1550---salujirisugavuxewe.pdf
    • https://ottenburger.com/userfiles/file/kupetivan.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acacc50a634---78338952474.pdf
    • http://g-shocktou.com/user_file/file/47677270272.pdf
    • https://sasalidayanisma.org/uploads/file/60214006145.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7dba7b4c---24979089397.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/debozorowovibunofabut.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/df27e4d9856d062fd7642f31d8cda217/wowuxopuge.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kemidisupemifup.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f6b2712d---94437966784.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-6-17/20210617202521882075.pdf
    • https://soalmatematik.com/userfiles/file/26151939335.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20f4d6801---95572891165.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6ac72d63665be7c2777bd62a49336673/libalivopijitatup.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/d9q1mddrs1uqcb51cfudtukraq/lodoteliboga.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ekr6866bqnfrjmrvoq7addtuq6/gitiziberiwetemut.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/30549735612.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ccrp5nl6jkjcn95fkhjmcocrh9/46393083424.pdf
    • http://www.euro-fly.eu/userfiles/files/rebepip.pdf
    • http://allaboutdowney.com/userimages/75888423455.pdf
    • https://rajakeempat.com/contents//files/norafolugixesofiba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+best+christmas+pageant+ever+free+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f03c.bin
b1ef9e28e81922ee6650dcfb0b5ebd8fd7c3da2f0668fb4926585eac26db155f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F03C 23780 bytes
font_01_sfnt_off00022abb.bin
f56955aede106b8a1ec05ffdeea5100839d7ea02570a32af565baac6f65454db
pdf-font-stream PDF embedded font (sfnt) at offset 0x22ABB 16412 bytes
font_02_sfnt_off00024147.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x24147 16792 bytes
font_03_sfnt_off0002595e.bin
c3747cf1c412cf1c76ac89476ca333dd0696089b461a1cbebcdfd6db4cc4d74d
pdf-font-stream PDF embedded font (sfnt) at offset 0x2595E 11068 bytes
font_04_sfnt_off00027291.bin
0171c5bcf05babf63a26cab05b34f4ad1611c7f825cc62997f9809368a9d6d37
pdf-font-stream PDF embedded font (sfnt) at offset 0x27291 4644 bytes