Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d51e3d02390f41…

MALICIOUS

PDF

107.4 KB Created: 2021-06-26 20:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c32beac1d5d718012d7a3634787acc31 SHA-1: e7cfc294769bcd2ad9e6c7a0bbcd68ad22c18728 SHA-256: 50d51e3d02390f4199cc105dbf95e3b2afbe94356ed31675e6bbebc379d9f424
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. These links likely serve to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/24uaevvmpqeok6lh8umalqitf1/vefuselirakufu.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea380c06f4---datefizaraderogufif.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7ea43082---fusemapixijewokubuterezat.pdf
    • https://healthmatters.me/userfiles/file/72697885028.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/73865388639.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c9c4fc7f9a2c45f44d58b061aee037ac/gedugekote.pdf
    • http://vodnik48.ru/content/file/91470707482.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a879e55cbee---tedawanipiro.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7a007d1a---89020459250.pdf
    • http://baigeleather.com/userfiles/file/23739161939.pdf
    • http://rghsalumni.com/clients/82979/File/jikegedipekoj.pdf
    • https://rajaunited.com/contents//files/mirovivurotuviz.pdf
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/87837878677.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e343c95c---jutososojabamazugajeduka.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/qa2u7oekdvqbjb82145lmjqrk5/20170560500.pdf
    • http://ladyqueen.it/userfiles/files/11666843303.pdf
    • https://coevent.ru/upload/files/20297359715.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b00dcaae---89489656472.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/c5d836erm58u7dfbmifno9laa4/pipej.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f79741a74f---xokalefodelumowuxar.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffc60520cd---jubufavawerasozadure.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5e8d01bc50bce1d559565bc0eeed0f9f/91843591386.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099f7fe8fedd---menesitefekorasenusom.pdf
    • https://waelfawzy.com/userfiles/file/
    • https://satuldelut.ro/ckfinder/userfiles/files/mujodomexumazememovojabe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=funny+man+laughing
    • 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_off00014431.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14431 16792 bytes
font_01_sfnt_off00015c43.bin
0cc138214f933734b6116bb6d92215bd9516cb4c00d55f2ee24a6eacfe71e336
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C43 17424 bytes
font_02_sfnt_off000189e6.bin
cfa97b0cf637dde56f337d6e3db334f5daef6e6282c16e6c82bf8543a2c56e98
pdf-font-stream PDF embedded font (sfnt) at offset 0x189E6 10128 bytes