Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20ce14360aa9f8b…

MALICIOUS

PDF

82.9 KB Created: 2021-06-30 16:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 221b8cead64149403584a6fb9d531d94 SHA-1: 5b34d0105720952c43a02c4cb7ed19576cc7c47f SHA-256: c20ce14360aa9f8bb33bd3c3a0ccaa2f715ff9dfccdb779e2d3b952fd7d397c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/344242e5cb847c75bf03beb5b4584022/58796307593.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd9037507---sofojidarevirera.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/icp217s3tebs1nt26jsaobi3m7/40115933178.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n70ikmhiue98kls037nnfpkbth/kefimalemi.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/zuwebumamigow.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/oj0988sho66tssf2646215kcvq/pejikaxodinewome.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/39298699965.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/ruwonagofekovorabetono.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d1702e7ef3b4e54c5eb2b4c4fc6925ba/85684267542.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1ea1174e---sewijejig.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/20b5b80b15cf05be83f5143e6ffb9a95/30460791984.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/gepetugib.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3bb4cba0---pejaruzijuzamujopagop.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/792959535bebf5f0687da77f67541ce1/4604803513.pdfIn PDF document text
    • http://laduses.nl/image/file/sixejuxovutu.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/biwizofijosarogiximaruruv.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848eb0d7bbb---66622607141.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rg0e19tdtokreensbqfo3qqko4/neseterovum.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ed39d6b44---gojebele.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/70226801720.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afafe35d37d---42778484552.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6ea0c1feb---80974275829.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/gagukabutofu1621120593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+draw+cute+christmas+stuffPDF link annotation
    • 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_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 10768 bytes
SHA-256: 1b646329476a6d4e70eccf047488fad2eeeb8a9ff69ce53f092542295af94e9e
font_01_sfnt_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 16036 bytes
SHA-256: ec8861ab3d58422550ae71dca84287a78c5f55fe772d80f2b953c5512762214a
font_02_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1