Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0164707d29a0a45…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 19:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30df0d1dc0fe21adbd95efa0daf288f0 SHA-1: c8ba080d0b7cf1dec66da37623fb2102e8f2629b SHA-256: d0164707d29a0a459375c85b0b87700f1e4c34122ab6a3fd032ad3f750320921
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://nenkin-t.com/upload_img/ck/files/zafavajebusoveroxifobol.pdf In PDF document text
    • http://kurumakaitori-one.com/js/upload/files/raxefejesenopukubipogi.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/96089945030.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/dadiderivuzevigibafor.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/liguvumezavojiro.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/17689172691.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/89750867249.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1631200654.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/29559730885.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c36e5f53351f8bb9881f95ba20daef67/josimivorixubotadewo.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/67007196676.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/riweximibe.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/bifutufuzupigogejome.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/sibobesududevakonetuke.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ab88f4f4---dewivodedor.pdfIn PDF document text
    • http://ccsl.asia/files/fovapex.pdfIn PDF document text
    • http://akgdsgfly.pretty-match.com/upload/files/66940710499.pdfIn PDF document text
    • https://dhesient.com/media/bifominibaledutawube.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/zusuxagekosomefisav.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/7669530942.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613b705839798---15946418899.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/12932108748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+view+saved+passwords+on+android+phonePDF 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_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 16588 bytes
SHA-256: 2280f7bc9fb9bbfc9d1a5dc5541dff6f433294a7ce5d51b4c24f63af50ad7b01
font_01_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 10588 bytes
SHA-256: 279479f2fe80222f5dc815392d08097a32fe560f696306faf793bb55ef48f314
font_02_sfnt_off000127ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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