Malicious PDF — malware analysis report

Static analysis result for SHA-256 df645daafe833e0a…

MALICIOUS

PDF

82.2 KB Created: 2021-07-24 19:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5458914847b8ea993bc9e65030675db7 SHA-1: cdb73a8d941ecc460d4605bc1a962c5ac6a3159b SHA-256: df645daafe833e0a6800ca4d3d88d2a430b5bb796cbacae58ff94196ad87e36f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://homestationrealty.com/userfiles/files/sipojopudokapelumuviw.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafb300ee34.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b631b623269---wixuwowejogulifisix.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4a310f72---84825476388.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1914bb5ce---rawawifiwatenijijawizot.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f50c978c2---furigala.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/13108013339.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/xafazuxusoto.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/juzox.pdfIn PDF document text
    • http://fitviewer.biz/files/file/fomobonezorunirejoluzup.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1efb58826---pubuwuradevixogar.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c00ed9bd71b---93596745108.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/ninuk.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/sakipezidofofex.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210706010716869130.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/49doqahpqsctms6ea8lp4q4oej/57150110121.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/6660510074.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d3e73529c4059a78ba077d47d65b3525/33944517963.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/pafetovebikuvufizozusaja.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/doresixujubesafarimot.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/dijujululemuvovida.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/60016140429.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/1ut2trmih0ci10ge5e633enbum/giruwiwovapoju.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcd80d3a7---74638216459.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/poletuwanusop.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/texixonuwuvobupowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=past+continuous+affirmative+negative+interrogative+exercises+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_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 11188 bytes
SHA-256: 08c23c778ce04207400a9cc7b2c892a0ddbf67116cb70f9daa57cb7c8f955207
font_01_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 18840 bytes
SHA-256: bb7b5b32fe4735756ce6d48711cbc6cc381e7f635f7c50fdabb9c53261912025
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1