Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe43a3b8a0f7e853…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 12:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 936dc71799c9dc51e93e0ada1cd30128 SHA-1: 31d572a3fd660741d3be4cf8f809d966e3211f43 SHA-256: fe43a3b8a0f7e853c3f5352df7aa58dcc89788aa4bc2980eadc54cb54903abb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and compromised CMS upload links suggests an attempt to lure users to malicious content.

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 https://synerhu.ru/uplcv?utm_term=android+iptv+free PDF link annotation
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d59fdb9e38---vubezorutexul.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bb86ad90b34c9ca1be570036ce29e6ea/52875944492.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/67920387637.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/rokala.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/nikasibakiperi.pdfIn PDF document text
    • https://laps.pl/userfiles/file/21933392347.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/pununugowa.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/7820212693.pdfIn PDF document text
    • https://termofriz.rs/files/tarokivenuvorisutibite.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/5843940868.pdfIn PDF document text
    • http://contextuae.com/resimler/files/95161884688.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/57241434004.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/bukexuwebove.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/55083419846.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/dakuperarifoduwefero.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/18813300147.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/97598965792.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/paradu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/mn6aku5va6uv35i0r96kss1p81/vurupajotafutijuw.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/69992225693.pdfIn PDF document text
    • http://clubblink.net/admin/upload/file/vifamovexamajono.pdfIn PDF document text
    • http://lukinserv.hu/file/xijapefizik.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/sojujadetosigigiw.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_off0000aede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDE 10160 bytes
SHA-256: 23ea567d9b6b888cc31829b4089a7cb4168f16856a06737ae047f50ed551be78
font_01_sfnt_off0000c5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 15964 bytes
SHA-256: 6caca61c21f16941fbe7dfd73d7ae8cc5d4380f99cf185f77eb0112d073ad249