Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e9e5b2614d8d1e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 05:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c804b22191ebd113c7bee65ab7d354ac SHA-1: 945140a00f8d616dad0c832ba327b19e47ab2d13 SHA-256: 25e9e5b2614d8d1efef288b5cd62ff77c9eba9bfcee431fdb0c7cc33656559ed
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting it's used to host and distribute further malware. The presence of a visual download button lure reinforces the phishing or social engineering aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f1a52b95a0c7a436362a21f564fe4f32/18693282867.pdf In PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7f87645d---22065169696.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/83796111643.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/lesoduronorifopoxomusuli.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/muvogopinitevezuzoxivug.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2e6465c5---vitomoxefupawobesulajef.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/wifukidotupulekex.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/69466065424.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333191ebea5---71858499738.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/86604466851.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/sirideva.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/1707413838.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/vitubitojixozojobigu.pdfIn PDF document text
    • https://glozor.com/userfiles/file/megedenasuzifib.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/91187553314.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/17445373298.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/ropubalinorikumutepimazob.pdfIn PDF document text
    • https://cmf8.ir/data/file/resapuguvimupowixibagor.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/xularawixovad.pdfIn PDF document text
    • https://robertbah.si/files/file/99091469481.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/74758126104.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210902_080521.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/844597308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=redmi+8+last+updatePDF 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_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 10584 bytes
SHA-256: b813204f93e5bfa077c3d19bee2246ce47264ee74471adbdeddbd09211631735
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 17696 bytes
SHA-256: 3ac7eeddf0505618a07fdab4297dd48fce379b5e48a643129e97c8e13f3f23ef
font_02_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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