Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e547ef1385efa9f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 05:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cab5bd9846f4ead080aa72045032a470 SHA-1: 8b5f509a72ca83a3ef50df158848aa51abf8b7c1 SHA-256: 5e547ef1385efa9f37066a2bb2aed900a4d4a15c95d1bf54684e04fb289d9e64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ketchas.ru/uplcv?utm_term=android+restore+trash PDF link annotation
    • http://movietek.vn/hinh-anh/files/65524004015.pdfIn PDF document text
    • http://receptlap.hu/files/lowujugiwatewupifanu.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/kozenufofidivigagubizujij.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a8ie1f3neb23r4fum5mol6nfs0/55041175395.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/jixeliwug.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/radinidubixu.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/38305942582.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/lovokinoji.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6ead96b058d50af57c81a0f98e71bc25/63738862707.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/jadazodesaliwisujon.pdfIn PDF document text
    • https://bdata.vn/upload/files/turupo.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/jimiriturividawixaruwodet.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/86679204441.pdfIn PDF document text
    • https://schmitz.cz/res/file/10344806895.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/bawujafoniro.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142adf5ac0e5---koronusujakeze.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/subugovibo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143ab1d66375---kajugabutibo.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16142afaf2031d---mivezexamezutupirukirepi.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/besiluminoboxaxoz.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/wixirozub.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/57958197548.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/woduzakakizezeriselejob.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/70804825267.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/betivadaranapid.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145249822926---jolonutewajanepolodivilod.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/nosotiwepokazezutisatud.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/subemufadurelibabev.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_off0000dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 10280 bytes
SHA-256: a2050033e34abbfb0916243159d8c71b516a5cee97d5b6e1dadd90d6bc8393df
font_02_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 17744 bytes
SHA-256: f3725421b62b7e8cf338045048c8f396438893ffcaf8f9d95f6102be4d3044d9

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