Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2a928054406ad6…

MALICIOUS

PDF

70.0 KB Created: 2021-09-15 19:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6dc4b440d51f93a66aee5f0dba1b6830 SHA-1: f004cb419697c605a1314078de96092e9e84b0c5 SHA-256: 1e2a928054406ad648c7bfdb03c6d3c4c19187585071d6acba4aeb2f96287135
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, likely to lure users into downloading malware or engaging in phishing activities. The presence of SEO-related terms in URLs suggests an attempt to attract victims through search engines.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://coretry.ru/uplcv?utm_term=gta+san+andreas+download+android+highly+compressed+200mb PDF link annotation
    • http://luligang.com/ckfinder/userfiles/files/75381045791.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/40449703069.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/zitesagujabazeseluwo.pdfIn PDF document text
    • http://moristas.com/userfiles/files/wazovilijowitadutake.pdfIn PDF document text
    • http://polletnv.be/uploads/files/30193021629.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfc979e74---gaxebi.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xotogugulugara.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80563c716---momegufatajage.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/24432827911.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/ditilurovasiti.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/zedej.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/76296470739.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/jepobipisefafajizuwigom.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/70910297328.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/66203270055.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/ragunajag.pdfIn PDF document text
    • http://pileki.com/imgup/file/71949923696.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161322848d4c0a---83909515171.pdfIn PDF document text
    • http://mlead.net/images/e/file/59733375937.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/23981865010.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/vujikuremi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16141ea3336342---55914789530.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/mewevorerenemaz.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_off0000b246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB246 14440 bytes
SHA-256: 42e5c672b44685627416c9b3f5eb94009ec037dfe4f71f5b3e629370a108dd37
font_01_sfnt_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 11580 bytes
SHA-256: 347f5a77577071584ae4bc1a89be5cfb7fde62c3ad6b1450bf8c44aac8c56179