Malicious PDF — malware analysis report

Static analysis result for SHA-256 9803d2b26ab57642…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 20:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3d06528f2fcdd076f1907a050ebdd43 SHA-1: 5e45ddd12e8184c48adad9e71f031b281059cff1 SHA-256: 9803d2b26ab57642b4e3a3d80741662cb64fb2719e2bb2a70f1ee456dafc7c1e
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it contains a link farm pointing to compromised WordPress uploads and other potentially malicious domains, suggesting an attempt to trick users into downloading further malware. The presence of a visual download button reinforces this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/681b4e6737f532c8a3b88f57b1c20905/8403863984.pdf In PDF document text
    • https://kaemsp.org/upload/editor/file/50736184888.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/zefewofeg.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/99272825585.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/80812386927.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/59927977310.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/jenizulupaja.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109071257524901.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/56072058681.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/latoturapuguwekowalikug.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613764adb2c00---pokusukoxedanewosowef.pdfIn PDF document text
    • http://hexindechem.com/upload/files/rafobunexajego.pdfIn PDF document text
    • http://capableapp.com/uploads/files/14603996270.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/64414777162.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae66af080---15424097308.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6340b5f73---pumadetamilemigosorafe.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d280dc2ab---sozuxobonifukanuveli.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/94908941326.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/vutosovalonabokugedenalas.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/28506720542.pdfIn PDF document text
    • https://majubesar.net/contents/files/fupew.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/63b5d69700b7b7f892219cd436c0175a/waponemagezipodidop.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109060038188409.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/wimigeparaxurigep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+manager+file+location+androidPDF 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_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 17724 bytes
SHA-256: 1d608a9ef5b7753da58967806d2d3bf2c4878473a678fbfafd69492c3c9eb77e
font_01_sfnt_off000110da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 10736 bytes
SHA-256: 897e15d2e2dc974a430a17672e14412706d0fb7b7029c5645404c519174248a2
font_02_sfnt_off00012954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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