Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd717984d1840401…

MALICIOUS

PDF

79.5 KB Created: 2021-07-15 22:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 285a707424703ab1d517b9d7e3e157e3 SHA-1: 5259030ea9e12d378dac0d1059c59aef62d1ec4b SHA-256: dd717984d1840401e431bcb60c6eb4cc4cc832930ee135a7f0eacc9ee66b70ff
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, indicating a phishing or trojan distribution attempt. The document functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary goal appears to be directing users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://verandapattaya.com/userfiles/files/58157095619.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/7scq8ehv02159gj277cd493bjj/mawuredafavasuzuzuviwek.pdf
    • https://ecoretras.com/file/jexovereludagikafofixobop.pdf
    • http://renovfab-menuiserie.com/userfiles/file/gupadipikazamobevawapo.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/517c32db2abec0ce287d404a987b82ef/84792386380.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160920e738fdd8---28882792666.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607392ce7a1aa---71460950145.pdf
    • http://medrea.ru/upload/files/76322682005.pdf
    • http://dambi.pl/userfiles/file/titifokesuvilatonagemise.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6fd5093b03e94325137ba603a5f1120c/32200637472.pdf
    • http://stinpo.com/ckfinder/userfiles/files/wujaripixapab.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/744d140d00e9267a5513267f0ddec6d6/rozedegisuvutosokobi.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce76d95310---tixefozikusiwedomit.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a023f2608e---62157781348.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1e6cab1e7---80922986027.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e5327b673---89940538425.pdf
    • http://garmagostaran.com/Upload/file/kakugugunurase.pdf
    • http://stylekd.ru/files/xasoteneva.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80c9c34fd---40851471070.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bad8d247812196fcfe2ede616cf15daf/xilojepowimag.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/dc963b20eb86312e3263605d95421805/kirojalafogevukaxar.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160984da24f7b9---30104773750.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=opposite+angles+of+a+kite
    • 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_off0000beae.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 16252 bytes
font_01_sfnt_off0000d48e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 16792 bytes
font_02_sfnt_off0000eca5.bin
5a7a64ee53bee9ca515c0b02afbc7ea8f868abff84a1be70ea5065bf95a9804b
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 10548 bytes
font_03_sfnt_off000104e0.bin
abaec9b97b8285f4761b9209800b846dd9b4f0838cb6861e1c922f79883a20db
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 16796 bytes