Malicious PDF — malware analysis report

Static analysis result for SHA-256 349b9e7dbaf1c566…

MALICIOUS

PDF

83.7 KB Created: 2021-07-03 06:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a2b7b7508d239f8c4517e5e752676c2 SHA-1: f7d8f96eac2dff30f0815ad7702dd100480d7291 SHA-256: 349b9e7dbaf1c5666675a5d87aba18e7517cd63fb296d6a023affc9480b3361b
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains links to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/55c8e78c18a0a1a5742a4719305dff04/13648063271.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/pekubodawulofozewababem.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085954c7b584---34101974761.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14480d2eb0---lutadinutajisu.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/576dcfd2f963921810e07158a7865a76/fukesorifumuziku.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b788cdb846f---gokowas.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7abb6e64d02083dde1c010dd3f012f5b/83229369264.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e648cb68---pexokaju.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771b68a3e11---40085999701.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fae66d096---19489474021.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/44490320595.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/64517489325.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-15/20210515145609918586.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1960f45e87c0c73317e4ab9cfc9421bf/34304139370.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094daeb9b1d4---totaligawomumo.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a168945c0e0---75144043435.pdf
    • https://africanresearchcenter.com/userfiles/file/33752128663.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/7981a17b21265ab602de8e3066fcafe7/sejogezisoj.pdf
    • http://wadirumshootingstars.com/userfiles/file///55509076043.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cucb0asc292dsek827qff0ml18/83979394594.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/240991f16abc9d013b7940150d42caea/94122375483.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cma8vi39iof124sik342bg2sk3/52641683711.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=get+well+soon+for+friends+father
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 16792 bytes
font_01_sfnt_off0000feec.bin
e7cb4e28c9640c088ff52c63c7b93709950826a36b6ae01b7728e2c69791699e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 16628 bytes
font_02_sfnt_off000129ba.bin
9e71bc2a6eccf0546e55d3d25461f9152befa402992a98ddbbe02c9fbb3e4c78
pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 10576 bytes