Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ea275a9a6ee651…

MALICIOUS

PDF

93.1 KB Created: 2021-08-11 16:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78b16b6a44f2788b56cb8a3e4279882b SHA-1: 6d17b728f597f9aa14ca12be1bf8019b798871f7 SHA-256: e1ea275a9a6ee651c5aaf19c1c1dcfc6ead18d791edb3dc6561b132a3f436956
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec58a4964---83923982150.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c9d365d90---togodatubudijaxewojuna.pdf
    • http://asfalon.com/__files/file/52658043623.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aab36e69e---48860179300.pdf
    • http://abwfinlay.com/uploads/files/wisemutab.pdf
    • http://crmloccitanecr.com/campannas/file/wanivivirivekepofowa.pdf
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/34169825940.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084279a35f42---fuworu.pdf
    • http://jfhconsultancy.nl/userfiles/files/50244619558.pdf
    • http://annabarons.lv/files/files/rotedesajafisawatupiti.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7eb6f39e---6451942240.pdf
    • http://aryajob.com/user_upload/file/63505913463.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b411dfaa48b---65086752339.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/fb75d285fca4da138a680c0e5279e3f3/25845633918.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085f57373ece---zikulusajevaxilujubasit.pdf
    • http://alphasigmaoverseas.com/userfiles/file/43346726266.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/betonop.pdf
    • http://softwarefactory.nl/images/file/gutibetikuka.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91f8fb32c1---84204397645.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/cd265d5989a86a6557f254495637500a/28833532600.pdf
    • http://m-camper.ru/ckfinder/userfiles/files/sukivopamebanoxubaf.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jt64aviena9o84bfke9cb97i7l/16834177260.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nominalisierte+adjektive+beispiele
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede6.bin
92d375c41a8c1ae6e486e9efe86464206259aff975b3b9cc29c66d44d2140685
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 18872 bytes
font_01_sfnt_off00011d8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 16792 bytes
font_02_sfnt_off000135a3.bin
038137de153de50bf225a88a35d6b1e53a13c6a49b0c074d22c19c2721f73fb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 10956 bytes
font_03_sfnt_off00014ec1.bin
adf38969d40f501586e0caf93d33991e243baeeecfe575c4831cdbf64b7044fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC1 16336 bytes