Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71d5f52c9d5c869…

MALICIOUS

PDF

91.0 KB Created: 2021-07-28 01:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 05aa8799d69ce760175d1a15125477f3 SHA-1: 0ff011e930effd815147ca684ad57f3a7ae58b97 SHA-256: a71d5f52c9d5c869255e0629f789121253fb98c83d83773bf8c3874d4d15d2a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The presence of a 'download button' lure and ClamAV detection further supports a malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/42lsoj53h9sm030re0mcvponof/reduvoruzavorofujupira.pdf In PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/puputadi.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/7281724929.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/romowolelufolipikexis.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/bazativozu.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/dfp7p37sghb6m68r0fhe935ov3/tafomogug.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b65d6cae1---26788568494.pdfIn PDF document text
    • http://valeneighbors.com/userimages/3689450691.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/5ed328b39dfa74be84ee0c6afb8797ca/vowozubetepovejegukimov.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ll15kce7keiminoloog9joa91g/5326146720.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/venabogisezusoneja.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/45b6b1c36ee134beb25c5b1b1ebbbe48/dapalabogomujufur.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/87855788320.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e54759e54---fokafezawosek.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada1b3c256f---2198931207.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/mesagapugubuja.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/5986138765.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/sigitijogowu.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/mutudixisowerezod.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/62055653095.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/kodif.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/guwovanegalenevuruwa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f618551bd---rozatebanodiguf.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/gelavefutamixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=samsung+frp+unlock+tool+pro+download+for+pcPDF 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_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 17624 bytes
SHA-256: 8ef57e5c5d611053860da8897743e8468514bd216a67574d124cdfb5ce7ce82b
font_01_sfnt_off00012bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 11092 bytes
SHA-256: 39d88446dd371f81822aeeb0c5e1c36028b5713eb0b31e1ebd7cf407b9745509
font_02_sfnt_off000145a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1