Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3ebdd5c56b06f4…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 21:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8cac7fd0164e94e735cc18ef515a85f SHA-1: 10dd56c845b2d5abecfcf83f5b03e40b3510a64e SHA-256: cc3ebdd5c56b06f46f66ac380805d439548c4fe67b8bebb1515f2e4c6a4f394e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations. The presence of external URIs and a link farm suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5bc21a82b161cf41b1dea4da501fdd52/88310598534.pdf
    • https://augsburger-dartliga.de/uploads/file/soxogu.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/e62cmrackm064of2mj7urqqddq/17270629272.pdf
    • https://adsbudget.net/userfiles/file/35097614595.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc558bfbaa---sadoluvulogujikurumabun.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/85577307783c6febad8c516128d3a519/sixulozejekubedoxulule.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e258165c82---28529923555.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/bifoberutuxofodona.pdf
    • http://exlluprimebrochure.com/ckupload/files/83170502968.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca525073b7---faligixuxe.pdf
    • http://honda-vo.com/upload/file/25313292229.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc99bfe250c---10398466567.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607af687e2fea---22266477594.pdf
    • http://www.bash.cl/media/file/vexobot.pdf
    • http://21cedu.com/pds/userfiles/files/87851236494.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f914d9d049---motozegitadub.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c19bc3e28d7---vobejitozujifoxov.pdf
    • http://hoangnamjsc.com/upload/files/24032214652.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b35280577---vevujawipuwataluselaxuko.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097aa5baa4b7---gewarugidesenewor.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af1acb61985---soliw.pdf
    • http://asbu.net/uploads/FCK_files/file/falato.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767960c33ef---pujafapetevokap.pdf
    • https://lasanisports.com/files/jifopap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=previous+year+paper+of+tet
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88c.bin
aef4ecc815a0de066a7ad2b7b514886ccdc06ddbabb7f4634b7a6bdc0a1e4f7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 17708 bytes
font_01_sfnt_off0001171a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 16792 bytes
font_02_sfnt_off00012f2b.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 16092 bytes
font_03_sfnt_off00014471.bin
d34c69aa9f3582b03c1214f69dfb1b3c53a4660c711d7288266d606f2bb41866
pdf-font-stream PDF embedded font (sfnt) at offset 0x14471 10480 bytes