Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f6a32f522e0e46…

MALICIOUS

PDF

76.9 KB Created: 2021-10-04 15:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bf31125d161d8c5e19a265a53f6c048a SHA-1: e2a4e0668ad279c3c0d26bd93a75a64d0023509c SHA-256: a2f6a32f522e0e465cc2cfd5b8fe27dcb2cbf08ace55ea5c80d2811853d0c768
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://fitness-base.tw/uploads/files/202109281905374943.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa7844538---22923476467.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/71385931656.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/98937099820.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6a64392183166a244d89aa31ffcd6bc7/xebirifad.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/88938228013.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zeriziribuku.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f38a81f809---66515440126.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2e1012cd5e16d11cd55802db64a498d3/ferexotona.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/jozumiduwapopaz.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/23958370253.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/bupujemeromuses.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/29991580565.pdfIn PDF document text
    • https://casaalu.com/luutru/files/19649368555.pdfIn PDF document text
    • http://ashioke.com/images/library/File/lavuvenosedegubu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/56858123905.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/55219769629.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/49660082380.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/67183600347.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/padex.pdfIn PDF document text
    • http://akgdsgfly.pretty-match.com/upload/files/vusuvevolisutan.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615954cc2cab1---zorij.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/jitulapanaxitipeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=wright+this+downPDF 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_off0000c859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC859 10264 bytes
SHA-256: 9ce422420306636e73aa39ba53ccb4a40f3fa80eaf90a02e055354710075a8ce
font_01_sfnt_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 17980 bytes
SHA-256: e45a7e4593f6f3a667dd3a9d97a6937b1b6a8a5629166f9d3295a7deda2f8fe4
font_02_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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