Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6f62fc19da5a6c…

MALICIOUS

PDF

129.1 KB Created: 2021-09-13 16:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95746b34e7378d5c15584caf08ea539d SHA-1: 28c952276386a9b1c6af2ae4dd5bac372737b8c8 SHA-256: 4e6f62fc19da5a6caac4d507bf095916cb274f6e0841a1ff21923659d27e0944
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. The document's structure and URL patterns are consistent with a malicious PDF designed to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://coretry.ru/uplcv?utm_term=inti+skin+ebook PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613714bd799c8---jikozazumusapitalal.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136a14493596---97134887364.pdfIn PDF document text
    • http://synphabase.ch/upload/file/raxujevojepadu.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/69538563906.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/65689713603.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/zimonido.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326626de1be---81040684713.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/32688091627.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/2920d3.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/51555034636.pdfIn PDF document text
    • http://husplaza.hu/editor_up/dukidibawi.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/susanukojutukarovu.pdfIn PDF document text
    • https://kaisar168.com/contents/files/91068007144.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/72753067934.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/talurogewefasogavawolep.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/womowokirifupujejino.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/44436407820.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/fuzexirubupotuvevotuxolo.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/51791757946.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/28127371389.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/naledipopigaderabivobas.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/xifakulubev.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/22866096819.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/7479604732.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/rodutarekowixetuzafi.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/bigizupil.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_off00018ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FFB 9976 bytes
SHA-256: 0ba437641cb7347a92884238d7933d25494a7886880fe98b877eae9cf693e072
font_01_sfnt_off0001a63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001be4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE4E 21424 bytes
SHA-256: b74afcac90e5816d1530200699e1753d2affc388cca16a7d20ae54ab0fa1a481

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