Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d8563efe3ac328…

MALICIOUS

PDF

77.3 KB Created: 2021-09-12 11:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1743930a0b7b6017a7e2df5c9cce09f3 SHA-1: 895b7c34d345385234d3904a93c80d4147a36c39 SHA-256: 34d8563efe3ac328946c49368cf1f9dab2931875666a714799c6f6a895913317
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/dd81831cbef0470d3524af47607d7143/88224233610.pdf In PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38354530997.pdfIn PDF document text
    • http://www.moyekolodin.com/files/boposabowamafugu.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109081634393242.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/jefalepa.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/wajavar.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/60697001579.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc05ed9d6e---xobamomiburuwinazupe.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/kobugup.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/40081504237.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/gisuzerubepajotimodoraro.pdfIn PDF document text
    • http://mdtrend.hu/files/file/vunusagudamasuzamita.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/teluwis.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/ruravaxovavado.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/68346236819.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/70734961853.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161378aaf8b90e---wanawuwi.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210912_8E421DC2DEC509F3.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/12511992879.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/vodunibujo.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/vokosidoji.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///41100608985.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9e444835---gepanadixadilakejaluna.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/26537169834.pdfIn PDF document text
    • http://netart.hu/userfiles/file/mifusuwanumonutefo.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kadofidoxixodowurofavovev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=redmi+note+10+pro+unofficialPDF 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_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 17908 bytes
SHA-256: 1a1151609221700a319393efebbf351dc35018715468e04939444f1488529a5c
font_02_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 10932 bytes
SHA-256: f0beca1461ec130fa0c41887ffc5707cd71f179c6e153213b0877276a610a582

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