Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d92eeb324dd00b…

MALICIOUS

PDF

67.9 KB Created: 2021-09-18 16:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f92d6131d01e7f92421b86e5885e5e99 SHA-1: 6ede2455c25060153f9571180c35c7c3fad78335 SHA-256: b8d92eeb324dd00b63c57144c2786793eff6484dfe72630b72e821eedd5bb541
154 Risk Score

Malware Insights

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

The PDF contains a link farm structure, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading malware or visiting phishing sites. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6460

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://csp.hu/editor_up/jazej.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df28437ee---nogutid.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5b2adc817---29839699133.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/56964158809.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/pumodiwujariseza.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/55165032117.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/bosiwexujugabubuluxusakoj.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/66472231816.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/kuwurine.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/50160190896.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/xopifufivawexogofeto.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/96076371278.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318e2d757d4---18843724088.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/88179400095.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/sedis.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/lezosuwulixurunuzil.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/15533626085.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/gabk76mp3p2s1j99hn1hku8600/mujetetejamegake.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/94060283482.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/81005113068.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/77607611140.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/29243785156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=blocklauncher+apk+proPDF link annotation
    • 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_off0000baa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA8 10360 bytes
SHA-256: e608c307550841dc30c78d0ef1dcdbca6dc39a7b5943402c6765ad66689411cf
font_01_sfnt_off0000d1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 16900 bytes
SHA-256: 6e0f44e2d36604dfef83372b251ebc2ca241d5855c282ab7195981dc8633fae1

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