Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc20c4a9717de15e…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 03:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 762117df15f3e584c663717855ec4ada SHA-1: 7782e29482e6effa4a0a4f72661452575e388d7b SHA-256: cc20c4a9717de15e8b4d18e52c522a5e403baea3b0fe20cfb539d42515567535
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e995f9d3fa---dumodovobefu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7cdca66ba---5227854502.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d738408b27bf2484712cd071eb86ac30/suves.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2a17fb73---mupanipaxa.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b282238bcc---61204145105.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/xowetopanakapug.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160947c2f66811---92180894398.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cadb3ad9---lanomidoturatejudaxenija.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860f4fbe234---81919187552.pdf
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/talanetivelekuwikomawa.pdf
    • http://jaika.in/images/documents/files/27579968701.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/2e3062908a06db0814b25b479ccf9e13/69477518510.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079783527df9---12422754510.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7b76ea34c37869132f0d62d17125e4a1/58550680648.pdf
    • http://meble-tk.pl/userfiles/file/kufazexatijal.pdf
    • https://moveo-sport.pl/userfiles/file/vemujumiliwajirumekekon.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f53f0086d---40838294788.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099086f0493a---zamokapoduxapowejob.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210614_923AFBD7F7506AB3.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/g3mh4d2qd7ltkjm5od83ihut22/kizofusu.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/28a9772478159f18735879b8cee6ac19/zovesuvamobomagufenatexu.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608d87693bd25---jumela.pdf
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/94332811525.pdf
    • http://ingenermarket.ru/userfiles/17518998752.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9f32d7a5---muxoje.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d98100e28---dazopibowekojumajozukamap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+exactly+is+martial+law
    • 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_off0000ef71.bin
1e6f34e77e2e7533c2728fee3b3ce9c1962fae0e735941dd8b49ec527a8e8184
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 16952 bytes
font_01_sfnt_off00011ba1.bin
0e6e693460be1ca5554fc2315245fdbb99a4be50f6e8e474e49fa8d386a44965
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA1 10568 bytes
font_02_sfnt_off000133d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133D0 16792 bytes