Malicious PDF — malware analysis report

Static analysis result for SHA-256 23200f2df4be8688…

MALICIOUS

PDF

109.3 KB Created: 2021-09-03 04:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bae3cc49980c46ce23359c1430871905 SHA-1: 5dc8c24df7991ef8143e0aa644736978657b850b SHA-256: 23200f2df4be868892990f83b03b7c7b84036eab88a20fcf78b5981719f0cb74
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3078

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 http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55ae1f0ec---dusoragovofokajuxadeguges.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4d3a56c39---fekosomofegefuvevi.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/39950376578.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/vulevonupopepamebid.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/17443694239.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2b8b9be9080b8053e3bb446740660bd2/zulilusapupafanoneb.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1325cf6d9---71937538092.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a483eb481b8---89519532636.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12d38d0f4b---71626465726.pdfIn PDF document text
    • http://coffee33.ru/archive/file/30460004619.pdfIn PDF document text
    • http://terminsk.by/pics/files/xinorukifabadirimezam.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/bawetufinup.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/netubuj.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/31913203072.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f7230b7d868c2eeb30c786517b90a2da/meredixofusu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ht7ujgniaf9f5sao9ms0n6f3pj/lijupolomobabuvepawe.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dff8ef736b2---5203396278.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/wamusekajelan.pdfIn PDF document text
    • http://yoron.net/up/files/dobotezap.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/razokinovifesep.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9fbe2b19a---783746511.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/rosesozix.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/79466520605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nikon+total+station+manual+pdfPDF link annotation
    • 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_off0001563c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563C 10596 bytes
SHA-256: 3d056210f3adbcff12324bbd2788263c5bc6a3551ae981b2a1eed7372dc6c1f4
font_01_sfnt_off00016e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E69 19468 bytes
SHA-256: 3edd604b4fd319b916552c5178f372c989e9a8aa6cb980c642eaf738acaeac5b
font_02_sfnt_off0001a178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1