Malicious PDF — malware analysis report

Static analysis result for SHA-256 27709ba53b486204…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 22:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43baf66c781959cab2c07200393fa721 SHA-1: 4565eb1138136047d846a4ff1bb6bcc17f1ddeda SHA-256: 27709ba53b486204801b823f0c78c08d69794fa9220ef1fbfbcb6fb4aa00f28b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://topoint.net/userfiles/fckFile/20210906150608.pdf In PDF document text
    • http://apsencollege.org/test/fckeditor/file/vuzevowojabulefodaxezufu.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210904031314.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131704f63967---doxepepu.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/94621321054.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/42929153412.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/39767296079.pdfIn PDF document text
    • http://charivne.info/images/file/35712760468.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/fazexuxuravofagubepiso.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/ligexanadiwupa.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/tufozutidem.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/bebonomudaxajejegupazada.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/44902588362.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/fokanakaxulerifo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace768d7db---jinededupovojegugazexi.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/tanomijowuwutikatix.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/takalimititexuven.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/89246566377.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0892a8d94---roratime.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/zejonoz.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/zotegigesanujej.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/80134490121.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/5239378532.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/97786279849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=javascript+check+android+or+iosPDF 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_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 18932 bytes
SHA-256: 55002a49f7a0e707185a32fa5bf90f008dedeceb34393a0df1b9239c74b0275c
font_01_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 10712 bytes
SHA-256: abd1b9f012707409c1e8dfdc5268f6432b2a40209ed22d1c54c758c5c59f0c8d