Malicious PDF — malware analysis report

Static analysis result for SHA-256 2556a71222543828…

MALICIOUS

PDF

72.0 KB Created: 2021-09-14 11:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 335302c4609970b462f8ea3ae51e2672 SHA-1: b73f8368c135367022c51b0619b4ed73870c02f7 SHA-256: 2556a712225438287407a9d08d6202f1df2672c82c91189829cbf0c6cddb8138
124 Risk Score

Malware Insights

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

The PDF document contains a link farm, directing users to multiple external websites. Several of these links point to compromised CMS upload storage, indicating a potential distribution point for further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2573

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6f27f2b8d014df57f3c255acd66e8715/27614327111.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/91892875378.pdf
    • http://digitalqwerty.com/ckfinder/userfiles/files/18826350906.pdf
    • http://directartdeal.com/uploaded_files/userfiles/files/69905184166.pdf
    • https://12shio2.com/contents/files/16960042468.pdf
    • http://3t-t.com/User_File/UpFile/file/20210913091507_bml4ZWJvbG94aXdvZ2lyYWx1ZGFkaQ==.pdf
    • https://hojoairport.com/images/file/bewapevigajatolakevovida.pdf
    • http://grandioso.asia/editor_upload_image/file/33643672714.pdf
    • http://inistor.com/ufiles/files/wisedapumijesu.pdf
    • http://ketphatthinh.vn/upload/files/mekomabupoxofetonoloka.pdf
    • http://bukhatirhomes.com/userfiles/file/14194868340.pdf
    • http://mikailang.com/userfiles/file/20210914130547_510418706.pdf
    • http://mayjack.com/upload/files/kopenozobedaz.pdf
    • https://mokshadhamnepal.org/userfiles/files/mepatibugimusaxezewu.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff76e3ac22---belalegexadowomataw.pdf
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/92717393079.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b45b82ee8c---peligarafusavo.pdf
    • http://kuresi-kaitori.com/upload/content_pic/files/janasazubamuxelasig.pdf
    • http://boki.hu/editor_up/fufujebatunokafoj.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/46903482535.pdf
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210906214738.pdf
    • http://ducthoaudio.com/upload/files/14368795990.pdf
    • http://vivatbacchus.hu/files/file/22171720876.pdf
    • https://zivotzaokny.eu/res/file/51826392403.pdf
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/fisozuribekosibuximaxofex.pdf
    • https://digireg.es/upload/11680692290.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=genshin+impact+300+primogems
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e047.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 16792 bytes
font_01_sfnt_off0000f85e.bin
ee18eca050138089d98a3d1516ae6063d1e6acdb0730539d4b863330e1496c23
pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 11108 bytes