Malicious PDF — malware analysis report

Static analysis result for SHA-256 46aee50571455eac…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 12:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 32eb0f40194dc101f8674c3f54fda281 SHA-1: cee00dca5d6ce4df59d7b7197a14ea877d8fbb05 SHA-256: 46aee50571455eac3458d1783f666db57246da836df3b36c943ef0b55d20d64f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of numerous URLs indicates a primary function of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dep14kirov.ru/userfiles/file/78577405933.pdf In PDF document text
    • http://yossy.biz/userfiles/file/76569596030.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/81e3d0f8c4bf61cd7c908f0d2252745a/deniw.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/tasowireremoferopexepib.pdfIn PDF document text
    • http://cwesp.biz/upload/file/83075649322.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/91352196286.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/visaxaxiwalibabidenun.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/7090256074.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e8be9daa6ae9483391d522577b01078a/nutusimoruxamironigezi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611efdd8cdfce---tigiwutubasonatatix.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/196b7b12db92bc78f182f0c893b9ddba/tosorewigeg.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/86245106340.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a2f9cd7b3---94986079457.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e1991ce22---zopilagapatewiwinegedobeg.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/noturiwaluvaju.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607edfda06d30---9590425898.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160aac7bfb5875---tabiresezi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcbc50c7c0---67645194742.pdfIn PDF document text
    • http://faradbox.pl/files/file/44876890264.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/631b16637077c1fded9e46f8ff26405e/mimepefovaja.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/8725947727.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9ecaa77695f871254aa17ec96f99107c/46963920173.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/72697958186.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/16125886805.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/memuderebuvogozitug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=topographic+map+worksheet+5+answersPDF 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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 11048 bytes
SHA-256: 8885d4aa5606ed2a5f4d67b61bfc6ae2eab94fa43230660cd76a9e00ff14526c
font_01_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 17264 bytes
SHA-256: f519aab5e39f28dbf5c6f93e9df53c16673bf9b265a2dc04acdd6c824785f9ab
font_02_sfnt_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1