Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31d5b0332e009f3…

MALICIOUS

PDF

90.5 KB Created: 2021-09-06 15:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee931edcd4a270d6fb867c13d9556b3d SHA-1: 3b81594fdb305f8c9cee2030f23c43f08703d4eb SHA-256: c31d5b0332e009f3756a464015c13796ce90923ff97388eb3b4e96b33dbe4b58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of a 'download button' heuristic suggests a lure to entice users to click on these links, potentially leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://dolnoslaskialarmsmogowy.pl/imgturysta/files/2932647189.pdf In PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/71401215660.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/kizerurorigadalifab.pdfIn PDF document text
    • http://chamdure.com/DATA/files/rewiweduleriduxosapete.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/rafexefazutov.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/73762019209.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083e05152486---rigamezaluzal.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160823dacabc7e---80830892020.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/66604185101.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/99819699750.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/45871524750.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608526e505f44---wiser.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/25832733680.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730f9104590---21605205683.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xinunidugojinadazevojo.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210707_014519.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c17b2928b---vibusu.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/vozuxebemenuperum.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/30998100883.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/84567467855.pdfIn PDF document text
    • http://susutour.com/userfile/file/31836759908.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/popazodizujatepobesif.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20218211022545698.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/vqj6fm2g0lrk84rqqjip60i03i/59203134383.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f15a8412---legizibigeboxifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cbse+social+science+class+10+question+papers+2019+pdf+downloadPDF 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_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 11580 bytes
SHA-256: 825f1158828b5cb807270341cf0effb8901494e21c37e191519901055cd2fadc
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 19316 bytes
SHA-256: fc51932a44e42deca2406a70cbaacd5c3c981f0772e9d105c141aeb8555251c2

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