Malicious PDF — malware analysis report

Static analysis result for SHA-256 c627b29af2f40077…

MALICIOUS

PDF

137.5 KB Created: 2021-06-30 22:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 213d03ec2759ca1009e302c880f4f03b SHA-1: bbc68ad7828c55a66592488c57b94ff06e77665e SHA-256: c627b29af2f400779c946d8834d6001216d886a5ea83ffcab4fecaa2c9478699
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack vector appears to be users being tricked into clicking links within the document, leading to the download of a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://intrigantka.ru/images/userfiles/file/93750816714.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160720710bc3eb---tapufok.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/tejotekepoborubuduwuliz.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/60881583613.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/dien4n1tc4hq3fetarhi1ulsgt/18001980292.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/13041454870.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d083ac1ee9---40576217119.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/fitogawite.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e6dcfd05---zotuzuzizerewutinutaxib.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/vitotobojikiwog.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9faa7c17a8cccb743a15a4813a45e5ae/97951319259.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/75134428068.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/vafapigoxisoxidusefiz.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776fe2f3901---77672100991.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/kunisosulesotubisililer.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5p9bfuce3canc5eg2ap0mml5d4/49279994846.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/74693780276.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aff0a985f---59306163633.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pivexodezepamox.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/fozasepokixesug.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfb3c3dbe4---nakasuzusefipemamar.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/jodomulawanexokaw.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/v05gkt94mlri4nfir0v4branj4/wedepudebufuxexafopevejiv.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607719b4d40d4---poxelugagezedenenorekilas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chemical+process+equipment+selection+and+design+pdf+free+downloadPDF 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_off0001b588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B588 17896 bytes
SHA-256: 3b30a022265368cfc959f949979c2b09c0ae66d995c55d400c9f92c0a95cfa57
font_01_sfnt_off0001e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD02 11432 bytes
SHA-256: 65926c802889fa13067372f17d6af151f6cdb8c7fa066f001802dddb1c9fba09