Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af4c236ca33cb16…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 02:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be670a46fc41e13ab2f151a5143c498b SHA-1: 179b8a0df2c4a985dc9265c3fc7a2be2175a6c48 SHA-256: 1af4c236ca33cb16ec09f1142c7d2875ce19e0645e3817df401f6b59ea572a7e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm or phishing campaign. The embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1c06795ccb4007a99167b5ca6b6c5adb/6122128092.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0k27fl118ckccmbgd48248crc0/59809736600.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/68133550927.pdf
    • http://baaningdoi.com/file_media/file_image/file/bojewugepuxepumalidej.pdf
    • http://musorcentrum.hu/files/article/file/65754799110.pdf
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/rotagixabuvuv.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160895516e75fb---16535913412.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/57a7896bd6f2b9bb334e49a4d38eb6b1/zivazavidovosesipudov.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/a9m8in24951g68p4dqmgh5r8op/14881926749.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7a17eab9a1fb600139074f4817083a95/tirudaguwujonedevagutaz.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082cdc3a7685---4857611971.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27c3b427a---pazovunuvagubavotebawute.pdf
    • http://bogelaipigeon.com/upload/file/52134459828.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/61a8d294b8a5b580db2405e87b8df790/funeda.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f7901cd9---54869372309.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608d69229e7c9---67291810599.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/05c40eec207a4cc614f9b0cf7d5817b0/rasazinevamupivefu.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2824265d8a---vafusolodes.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e750b65212bc91afd3780b71731aaebe/mefovukekun.pdf
    • http://minerva-collection.net/files/files/27455418136.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/drhhe7jucf35v08hghu8f3khi0/sakaletaguwobejovofavap.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/acce600f5e839f1cd4a8b96ddb82482d/xikanewudisoxetalovefegar.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160838abea20ca---fafaterugudowitoripe.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/56693812153.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/dc8b86b1bc64b7652c320e8ec3d3723c/276940593.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+remove+black+marker+from+clothes
    • 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_off0000ee11.bin
1530af3d72c6d8c5eb90651337f932c65214511b2d1e8f466bdfdc2b0f4d96c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 10780 bytes
font_01_sfnt_off00010701.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 16792 bytes
font_02_sfnt_off00011f13.bin
be8c20747bd070e915359a311574fb9ee22d107523de2f612d6a90fb4f96dff0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 17232 bytes