Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f4c31eedfa1611…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 15:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb5f823a4cd6b2d6451361de62c6df15 SHA-1: 12926d2665b4409890b3e1b780736c01f0e66242 SHA-256: 11f4c31eedfa161129ff7311a3f98ce694af70ec8ccac36530dd433160963673
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm attack pattern. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://offerseir.com/basefile/offerseircom/files/kagoguzuwagukumos.pdf In PDF document text
    • https://mywayrtk.com/userfiles/file/wimivugi.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/lafupad.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/4b86837f294a312b94c6c3f1b7dc4fc8/56928048749.pdfIn PDF document text
    • http://mayjack.com/upload/files/95521916355.pdfIn PDF document text
    • http://tzsunup.com/upload/32713682548.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/rapozadata.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/papaxawadamazuxiroj.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/tonifomanotowal.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/femudu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613651633611a---83761980699.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/76427628785.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/16041162005.pdfIn PDF document text
    • https://emenu.hu/editor_up/mibemajubebid.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/68959851817.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/tugasur.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/binapakobagu.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/duwikukojuminug.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/81981928444.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/77427134943.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/56686439780.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/93033970179.pdfIn PDF document text
    • https://ijp2.com/contents/files/19745312332.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab27331c0---79714043728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=goowls+camera+app+for+androidPDF 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_off0000c08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 17876 bytes
SHA-256: 9b75270dbe958739a955aa7b1bfbb5a4458ec73bcff3d2847c5885664c482c33
font_02_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 10808 bytes
SHA-256: 23f50c7cc0498df89421708c26c9d660fb82c03d60d147edcc18c7257baab6b5