Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e276984f6a62d90…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 15:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a4add9b52ad29970bef89add0f1159bb SHA-1: 8a4e31efd7d1374deededbcffd773210ff316d2a SHA-256: 2e276984f6a62d900510bb6b0fe43dfac2a318152ba45009f5a5ee355dcb868a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on potentially compromised or disposable domains, suggesting a link farm designed to distribute further malicious content or phish users. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://7seapharmtech.com/Uploadfiles/files/razugobusemavejowofosepew.pdf In PDF document text
    • http://textstricker.de/benutzerdateien/83926551897.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/pesevetunebebokuwotiveb.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/40389429970.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81fb1efa4---kulodobefagalelobuzom.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161403b62513e7---robatuzu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd0266d8a---toxozegokadat.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/femojelixafutepikoges.pdfIn PDF document text
    • http://glttek.com/userfiles/file/tofupilaguvuluzuxagununas.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/21223233778.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ca6dad22f5ee184e435c852932fd5beb/23623912924.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1sbgdo8l21cqq5h0m978457ga3/37430132503.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/bubarubefa.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4efbe7471---14313310415.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/84736124212.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/65459251312.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/469a5082f36d642116cd10dcd6e5e6f5/mewinuvavazonaxawewurew.pdfIn PDF document text
    • http://didula.ru/img/file/fulupob.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161381cc20f7e2---60451911948.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210917155119387.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/vodepuri.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/71601095255.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/1731956909.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/86762052086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=digital+signal+processing+s+salivahanan+pdfPDF 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_off0000c5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D6 16700 bytes
SHA-256: d53ff180dce9db9f995cae28f24a07abee569f14a3368ea6527c208947299027
font_01_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 10964 bytes
SHA-256: fd3bfbd992d0cab5db7ad57d3c3c7992995c01d9644631a367bdb169f2d6c527