Malicious PDF — malware analysis report

Static analysis result for SHA-256 15675d550fc5e56d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 17:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af03aee03e0d8b1ceae2a3f5745d38a1 SHA-1: 4929f13cc214ac918aa7c12dd7b4bde892700a90 SHA-256: 15675d550fc5e56d3f4a5a15ecfc56a3d1a7d9d6dabcb74d18cd411a4e052214
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself, combined with the detection results, strongly suggest this PDF is used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=add+editable+text+fields+to+pdf PDF link annotation
    • https://papiratisk.cz/soubory/9913288714.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/jadedutaxo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jotalitabe.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d4c776e4761ae50fadf953b48ae2460e/dabod.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/45488897098.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2dce4e10---pazusozusetemotu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f51ecce7a---jutiwisonowizal.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/79887456013.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/90e7e9e055cd36f05ed0bdde4ad134eb/matibakam.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fffsmb76ifepuf0vgs3snv3r25/84075499317.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea5e46059---8334874877.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/42330220755.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160824c1d0b35e---kefejotonulilu.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/sifalavumezir.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/94634948816.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c815eeb93e---17469097232.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/n0v490oatsabcd48mhtanebdvu/93609436923.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078704317cb7---supunewef.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cc85ad94---mojekazozigudejesodeviwur.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/58879098793.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/sakewulok.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c7bcdfe5c---jajabebuximijurazaj.pdfIn PDF document text
    • 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_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 17236 bytes
SHA-256: ac130328259da7928441c009cb3ed6bf2e243d53366141f917c1ddb313f1f32b
font_02_sfnt_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 10508 bytes
SHA-256: e14ca6fb2d59aeadf8642c2b0ba2f8e96e5b17795e3b148349185962c989c2df

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