Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf08f9e512f43dc…

MALICIOUS

PDF

100.2 KB Created: 2021-06-30 22:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b76b2c93e8a8fb8db33e373eec3a6f6 SHA-1: bacf773b3320f203591e225dd9f1ed4cce9f86fa SHA-256: daf08f9e512f43dc0c399916fa8e5212bb0f54ba3d43ab30e19148a66b1cd42e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress sites that appear to be compromised, hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document's structure as a link farm suggests an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6ae11142bef42500cb2801f5c1d32cce/fepepitajeke.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56ae55cdda---disotadafe.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4ab1521f9fd910492cec68822e04de08/20778518060.pdf
    • https://wecareu.net/ckfinder/userfiles/files/zojafimen.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160893e65c5ae4---lufojotole.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/93c54504c47ce119e9a90f233edc5c6e/redalogowukovuju.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/580989a78075dcd9a642f162b0f00880/41623852221.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b805d2ff---lejivosudunosuxodo.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b30aa11a81ad9cf771b745dd06fafe29/bovuforamipapifitas.pdf
    • http://digemnd.com/UserFiles/file/pefirunosixojesewi.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d1bc1e9d958fac0962fc87233b492e58/87305638438.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b4b14b7a5---dijunuki.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3e8378b1d67c8ac42cf32926a58defc9/rijanapufifi.pdf
    • http://hferrynetworks.com/FileData/ckfinder/files/20210624_26E999195114A1D2.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ririzudalagatuvemoxeku.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c779b6371e5---vofibabuvevutesemajisulom.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dae5e86e5183a4f5276ebf7934dd2a80/lulexepetafukasube.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef28426ac---43233391709.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/b9832f6ce3e426a009307ad582d59ce7/sekerani.pdf
    • http://cdmatik.com/uploads/file/68268000086.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d08ea0b845---wosozulivozisogi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gcse+geography+model+answers
    • 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_off00011f75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 16792 bytes
font_01_sfnt_off00013787.bin
3bd170469c1c11e87ed7076a7fa40498d0153ac5fffb16b70ca0fa2ad04d63fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 19172 bytes
font_02_sfnt_off000168ff.bin
49d7e0d356aa8173617da7629ed9008bda2b918a4c37d58a7cdbe741faeded82
pdf-font-stream PDF embedded font (sfnt) at offset 0x168FF 11012 bytes