Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd5abf799f95196…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 10:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69c422186201e795cfa10d2d9a5cf9a2 SHA-1: 1c0dcd2ef0eea2f5938c8003aa84f6947a43e143 SHA-256: 1fd5abf799f951967e20a655686fbb80adbd6bd6348dd36cd5cc5fd436209268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document appears to be a link farm designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b93511cde495745d1b5b9a16857973af/ratananuz.pdf
    • http://horizonpestservices.com/userfile/sevijujexilu.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc787ad38a---lotemebis.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3822d65aa---70047834285.pdf
    • http://euro-ex.net/images/blog/file/27819359933.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/dc50c3c9f14466aeb263c562f2522549/mibabojamonaleji.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6d1eab6f731cf04f7afdb12718fbae9e/davugawosugatag.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/32eba13fc4fc44b4cf0196948d7968a0/valirekiluvamugoxufime.pdf
    • http://newdimension.su/userfiles/file/87478448982.pdf
    • http://dreambeauty.kr/upload/fckeditor/file/midurilorofonitujekuwoki.pdf
    • http://www.tramag.pl/upload/file/16603350530.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/361e8ee26260b600998eb0f4c38b5132/pupaxodewebajokipazibon.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16070b792dc8cc---bikejakizelesavokode.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a923e97e85e---19736966375.pdf
    • https://daulte.ch/ckfinder/userfiles/files/wevazosaza.pdf
    • https://mebelihome.ru/upload_picture/gokogesu.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/koierv0impgs9gcev29tmg21lk/sunogotojerivij.pdf
    • http://ohxto.com/uploaded_files/userfiles/files/97734870371.pdf
    • http://besteva.com/upload/files/varezipof.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c7671e05ec1f11759b212b08724cae3a/tilupadijubirasadogenu.pdf
    • http://ciccioinpentola.com/userfiles/files/57140554984.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c686aee5a01---15921224277.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bio+for+drawing+artist
    • 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_off0000e121.bin
25e4a7cfb01c0693766648c61cfd0c4feb49463ac83e92f32cc666768b7a573b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 10492 bytes
font_01_sfnt_off0000f8fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 16792 bytes
font_02_sfnt_off0001110c.bin
4595416e6bfa083d70e9e2a91af9303358bee68257b887f835b99feb12ae3eed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 17696 bytes