Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a54bb04279f2cc…

MALICIOUS

PDF

85.9 KB Created: 2021-07-07 22:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 65ad0700f86593facb0d0ac105529814 SHA-1: 514946228126faf851b4ddcf03c4e8a87b04e0ca SHA-256: 52a54bb04279f2cc815b370878deeadd053ef4aba493eb44b3b9c043da09ed90
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d530e3787e---dusoxi.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7f3a8e1c---96630540071.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a395a2775919d492486ad48393b6651f/fuxoduwufakadu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093a497a6f2b---dimavisiseru.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089add57b3e4---jozam.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/95164279469.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970a57daf1e---nexaz.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3037b70834b1229923f832b8304d9ba8/zoliga.pdfIn PDF document text
    • https://giustofiori.it/file/loborimaligemonife.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b472daaa8---64129466340.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/20413406836.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb715a1bb---sabufulonenela.pdfIn PDF document text
    • https://digireg.nu/upload/levizaxatenezabegi.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/284tkiqvfn9g6jc3s1a792tdobobofs4/46853999870.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/43fccb147d4db640761bbc2dd393eb41/diwijifugojutaxe.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609573729224f---kusemodesaragudajemoxepaz.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/3205mhn2mkero0m4jhqqir7ce1/nafunefuletutisar.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/2294823b1914bc8869561425bc60ae0d/terigofaf.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-7/20210507081207924986.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870cdf54ef2---wiletuzebuzebevamu.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/47390716690.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/04a284f5bfaf0ea76d150bd366935b49/rilopesulirorinobivuvupo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a28a57d206---dusimej.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4f697ea3ea3aaf8ee8bc80432e1bb6f9/49930222159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+3+little+pigs+charactersPDF 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_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 16816 bytes
SHA-256: 909d9a96a643c79991ed3d24adf5973b2c9fc350a270c0440fa35f2248d2de56
font_02_sfnt_off00013249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 10564 bytes
SHA-256: 5e93d4d9de0c1abd841a7dca1dc675cb7374c302725927655ce620d5843e1b0d

Open this report in the interactive analyzer, or submit your own file for analysis.