Malicious PDF — malware analysis report

Static analysis result for SHA-256 e412e8eb42134446…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 00:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b99519fd8c4ad47a63be55f93aa4facb SHA-1: 37d94782dbe1dca14376bbd2e9acb9bc3d825b68 SHA-256: e412e8eb4213444604e4b161cae221cd8bf463ee6bd79b2a18e95c4101340d5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kozhikodedeaf.org/admin/my_files/file/lepatogarelimimepasaj.pdf In PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/85907187091.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/48735951265.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105132026.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/37672376771.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/82165695959.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/wesulebefagipunefolu.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/79740940223.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd446d498e---74424543353.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c52913e3fad---woxekupaf.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/72127354810.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7fbaca71a---zajulanilelepuwurudoto.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/xopojukefidabapadofax.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/48265744398.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/29536502290.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/53625791903.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/gepixudilogijasejikevo.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c7955c05242d0a7dc34d6e0acbb142ba/84726456364.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ag24krtsp85gvijarufoikfos0/zafudijamowemupetozudako.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/97568220199.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/apgg4h2m2h5gtmq136p4flln59/guxoxulizopezalu.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe8993aa53---vokawi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b921c0fb7---pewomepujaz.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0facfbed28---xazowonunupifutak.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7401c3610---7288009726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=quit+claim+deed+form+texas+pdfPDF 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_off0000bbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE6 17024 bytes
SHA-256: cb3e5fc3615b07f7aae8eab51b054709f4bdadd3b3794064e6c6d5b524f24a16
font_01_sfnt_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 10940 bytes
SHA-256: 9d16b2a4ea604ea8c92ec80183b7fb65d8d31dba847ea891033013f66a736e33