Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53a412862ce4404…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 18:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07d7b8407a5e7db85c9c77a3e5a68b82 SHA-1: f9747f87a931313eaf7062ee671ef8649a6e7073 SHA-256: d53a412862ce4404a0cdc32893e147282635923bed2a3a8db266a2971eae3bee
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's structure, with minimal text and a full-page image, indicates it's designed to trick users into clicking a link, likely to download a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=gmail+app+download+for+android+mobile PDF link annotation
    • http://quaint-house.com/images/blog/file/dafunug.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/604c96e18d1f8933059cf77f30032af4/43712689649.pdfIn PDF document text
    • http://legouic-peinture.fr/userfiles/file/kejipavaxijekexa.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/58591669336.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/ranisatola.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/fusegovikopaxudaxevenesez.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/88841711407.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/pinufezukexolebuwotawu.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/tibalawitevodog.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/47190404442.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/nowebugekababujomosiligef.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142f60291a77---24059060799.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/vewulogifitumosiwal.pdfIn PDF document text
    • http://deforma.it/userfiles/files/pozavemexi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140293508735---zetafubuve.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/614c091a24904.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/wubawolelisinimoro.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/35052728841.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e5b192d8f4701a71a58e424bab42d401/raxobegexefamogidujofiba.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/wedejazopuk.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/86315714423.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161414d38a2ac4---1887111048.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nadukobemagiri.pdfIn PDF document text
    • 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_off0000ae3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3A 14000 bytes
SHA-256: db37468cb7b2f1a8cb4a64d7512c56392c398d49c343de79a638338f4a2a7736
font_01_sfnt_off0000d0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F4 10660 bytes
SHA-256: 44d1ee19a4ab546d9fb0fe0f0c86f0df0c8a4b678f2d200b38b57654e6a03ffc
font_02_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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