Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d9319ce65dbb1d…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 17:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01e4731c1c38e003186d2ef7ff1a7345 SHA-1: 0ba33f19bdb98e896be45e4ddd6aa4084568e32a SHA-256: 14d9319ce65dbb1d8ebbb46e9e4a323a7558b39193c2b5c9074506eaaec51b19
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of numerous links, many with UTM parameters, indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hak-al.com/resimler/files/lugusonibamotakuweba.pdf
    • https://khoahoc.timviec365.com/picturesfiles/51344732440.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/406b3f611510f634db4025e54eb087a5/sunotifivupuvaguzulibubun.pdf
    • https://snf.styleguides.ch/userfiles/files/31268873464.pdf
    • https://fleuriste79.fr/ckfinder/userfiles/files/fukekaxejarepuvese.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb3d3e3bf---79883104010.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613239a5aebac---mexefixifu.pdf
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907030340642352.pdf
    • http://4998horo.gmmwireless.com/contents/files/31114277264.pdf
    • https://codecs.ro/images/file/tarewalitigikajini.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/fakp8uff4h9om42401obp108g3/77573921898.pdf
    • https://portalbime.com/UploadedFiles/New/file/97626977832.pdf
    • http://www.aportecnica.com/imagenes/editor/file/5009997509.pdf
    • https://wasael.com/userfiles/file/pafafodawebiz.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bbdhskr1shbs5h6msflhs0hqh5/gamawofo.pdf
    • https://makanbanyak.net/contents/files/5806409829.pdf
    • https://iqrainternationalschool.org/_assets/files/2246012095.pdf
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/26247629359.pdf
    • http://ampletrekking.com/userfiles/file/58379481444.pdf
    • http://selidbe-beograd.info/files/netororil.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28334913449.pdf
    • https://tskrea.com/userfiles/file/butadewoditin.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1af33ccd569f54f962984d4aff9f371e/47029730264.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pdf+in+macbook
    • 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_off0000b7e8.bin
c5d891dc78f8cb438e1e36a9f532f4d1b2a76ee7f19be7f1798c09a3b357ee58
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E8 16888 bytes
font_01_sfnt_off0000e404.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE404 16792 bytes
font_02_sfnt_off0000fc1b.bin
cda52f69b94f14746062f317dcc7f4bf28f2237e7a3c7df81b0c73a062d34aed
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 10324 bytes