Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0f941de3ab2fe2…

MALICIOUS

PDF

83.9 KB Created: 2021-07-03 11:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b38fcfce148ffff66835e19b4a946a89 SHA-1: 7534cdf5e89d57392cacc41ebedb1f43183c6874 SHA-256: 1f0f941de3ab2fe2d98c4b5b36ed862702bdd7dac97acf8b0325752b3af1e1b2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics indicate the PDF is a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs hosted on such infrastructure reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982e8dc02a0---jiladoloxarupo.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160835db7d4c0f---74869449230.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c4386c880---13416950699.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0584628a4---dikafebogupesosunefibi.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cf04f440751391f731a3bca638503cf0/60629990675.pdf
    • http://immobilieninvestors.de/userfiles/file/94728234946.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080432317edf---pewiparenegolopupazo.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a28098226---76467954056.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b9aceb03---kajuzib.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a594953a7aa---76406254685.pdf
    • http://gyobel.itpublic/file/55288587610.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832ff6f869---vubajarok.pdf
    • http://resetimpianti.it/reset/public/file/83452596510.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9d3b23ff7f981d4364c4e6505072e48b/28914384173.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607479c6374d6---65521132121.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffcab9d6c---vujudikodoratona.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9586c95a80---rokopejak.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2764d2565---9762912620.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6dfecf49c---22302136677.pdf
    • https://srilangkapools.com/contents//files/topanokigufopidobuzusugu.pdf
    • http://anhbanglaw.com/userfiles/file/18900142664.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=blessed+baby+boy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a8.bin
06639b3b37886594c97b952242c824e9b9811d6bb7ace75a1fd4ed1d388c1134
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 17688 bytes
font_01_sfnt_off00011418.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 16792 bytes
font_02_sfnt_off00012c2f.bin
c7a3da7360e6a540f7fc82922d7aa420d60028a896fdc085a8c0fd94bcb610ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2F 10152 bytes