Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9f39d95da9bbd4…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 02:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afaea2fb5e613919786b1a0b7448c8ae SHA-1: 589f25f0452201101f036bc9225eb3c1320ce4e7 SHA-256: 2f9f39d95da9bbd43fdabec82db166c56b9e23db6d03be55e6429fa3a3bda4ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to multiple compromised WordPress sites. These links likely serve as redirects to phishing pages or malware downloaders. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/25dr4ig512rkh6es6blrqq5s2q/jatelaxovi.pdf In PDF document text
    • http://dermalab.pl/userfiles/file/17890527624.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/zedifada.pdfIn PDF document text
    • http://retrofotr.cz/files/file/zilugenupojolegomog.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/92891525525.pdfIn PDF document text
    • https://memoservicesrl.it/file/27015478193.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b07d037670c605c362501f3a899a05fd/kitaxatalemasajigili.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/06c6587aa76c78a6e5078b2c658de91b/kewotox.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab1734d74---83633406089.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/94948783881.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1c901ffd---58826926730.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080a77fad9f2---34480493911.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bde02486ab83f3a4f8f0a78e3badcb19/givobegepaxategapob.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/jefaxu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609e250bc77ff---99434965258.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/19002041902.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608540e975ecc---33818962924.pdfIn PDF document text
    • http://terminsk.by/pics/files/belesasenavasepe.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/piwiketidaga.pdfIn PDF document text
    • https://fallsplat.se/file/38883924478.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/44388280420.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7cfc8800a---tujokevowepisirazage.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/lofikigamabeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rcf+8004+as+manualPDF 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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 19476 bytes
SHA-256: 3527e6a2b40e370c0644e1b4280f55be8c44a45de1958ace724f2e45c2dbe082
font_01_sfnt_off00011352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 10508 bytes
SHA-256: 952921775c13c4449dcbaa74455731f0b7828ce60b51ed240822c4e0255962ba
font_02_sfnt_off00012b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1