Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4eb240f7fd45ad…

MALICIOUS

PDF

85.0 KB Created: 2021-08-04 08:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11153b38902c9a95c8ed087212d13067 SHA-1: fbecf60b9eed4d89261735b3947a161b5adc0b95 SHA-256: de4eb240f7fd45ad4354814aa8e6429b5f2cdd0b7aec8198c31208488d8dea26
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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
  • 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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7969cbf9---77066599445.pdf In PDF document text
    • http://yonseri.org/userfiles/files/53183880055.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/pifuni.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d9e7a1b2e---31104045888.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ba6d17e2ae1acdb897c88b2b73c1bd02/podewiwabobewig.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d9cbf39040d872eb4112a0f80c0c3231/lekulojejo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3253a9067---61301789919.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/b1c413b612e12c0511e3887983c7eacf/talobavuv.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/fc3f6ea9fe1d04f804c61ef22d61f2c0/tofuwuzirujinu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607628f3c45c5---zogekadujibilimanajimeniz.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e5b167bd7de4173f22549090f9b187c/dolovipajidiluzopagukuta.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/47451698953.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a19651f75---fedilijuvez.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/pobavutobovumu.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/56582973947.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/viwibikukowinajewagavu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8384bd206---najupajedovajoduruxoz.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/disutotus.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/61032005538.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/duxaz.pdfIn PDF document text
    • http://rhondachem.com/d/files/widagiwatoxog.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/38804389130.pdfIn PDF document text
    • http://talleresjpg.es/img/file/9081990436.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b57be1d893---ropukopojib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc5a67eb2b---31465416167.pdfIn PDF document text
    • https://iword.de/userfiles/file/37781673162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bible+coloring+pages+for+preschoolersPDF 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_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 16764 bytes
SHA-256: 156aaa7e1692a7f0a126f99aaff2e1200edcc3275e8bcc767f3e26c0d31280e8
font_02_sfnt_off00012db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB7 10852 bytes
SHA-256: 3db50f62020cb97abadc1a2a47967df86d92b626c4348f0ae31d4074c172ec46

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