Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5c4852bf14ea46…

MALICIOUS

PDF

83.3 KB Created: 2021-06-25 13:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6bdce7b8f19c0a16eeb2e6dae170631 SHA-1: 172fe38ba3bd61728d380e1a11133e6b6b3ef091 SHA-256: 2c5c4852bf14ea467373993cf2cf4e4d88b21b6eed82238e1181420104293208
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The embedded URLs are likely intended to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07d1381ad6---wepubifuxosibon.pdf
    • http://jarosi.hu/files/file/vitizotevenafuxutatupu.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/lnte1jmh4bfg1aj8jgqttansep/barewuvu.pdf
    • http://chinasoftcore.com/userfiles/file///19570691940.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/f64nlf75qa2a1duduc046dd0j2/42059856859.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9sfsuv9g3e1g8tm4j30ad7j8mn/75884258600.pdf
    • https://publicbridge.pl/userfiles/file/11346793382.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9f613db1b---xoduwofeni.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2831d79898fb83d18e447f7224bb6eab/27220588900.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b66f1613---49690708679.pdf
    • https://bestcoloringpages.com/userfiles/file/mafut.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607789506fe0f---dugodu.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/gukofisuvebed.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b73c475fe7---67099857308.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8f9225b83741e4e1889837e89a051ca4/6546497005.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fab4821c8cb97de7a713775c319a1dde/fiwetefedilomipulape.pdf
    • https://gloriamus.org/Uploads/userfiles/files/vunusejuxabosopopagokobun.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608905feab8f9---wipaxabopesatawakunolo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=exemption+under+section+11+of+income+tax+act
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d3.bin
03177c97290a6b4e237ade3d5a80724998bc6d2015feaccc55291254767d75c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 17036 bytes
font_01_sfnt_off00010f4d.bin
2c93ae0b7b909ec2875323c27ed144f1e32cb0e7618ce37345383d7c260e5e88
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 10972 bytes
font_02_sfnt_off000128cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128CD 16792 bytes