Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b578a8aad7f4d0…

MALICIOUS

PDF

70.3 KB Created: 2021-09-06 20:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffc92c601b3acf7c1a21a36e90aad1ce SHA-1: e4c8b1784c5e9b129b4bf2d3ced2faca9d879a06 SHA-256: 12b578a8aad7f4d0601d90fe90926521beb95443feef8a85370bdd12b1fd4667
124 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

Heuristics 5

  • 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
  • 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://www.celso.org/download/50407521660.pdf
    • https://gyn-koe70.de/obrazky/file/25631867830.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e85a2b07---4733325580.pdf
    • https://bhandarisurgical.com/ckfinder/userfiles/files/55888494775.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/fb41c71f629480433dd6195e6ddb1171/bilorefizigawowe.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/xovowixawetegetik.pdf
    • http://dakmet.pl/upload/mikepuvanajefoserugajake.pdf
    • https://bestofbucerias.com/upload/file/60192577558.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161168535ab53f---xeseretuton.pdf
    • http://hzjksj.com/images/upload/File/2944062704.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/8p8aet467ihmqbooj0ctj39r26/kegul.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a524d7e0677---rapoziwaf.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c22bba179e4c4f610cc341e6588c65a4/11946934235.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c627d362115---4120319984.pdf
    • http://akinmedikal.com/uploads/file/lazomulojuvalafile.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2231ac71---siribos.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7a68011cd8d642f67eeacfc3859114f4/sufatezabojelinapizezaro.pdf
    • http://peter-scherer.de/userfiles/file/wotukofov.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/753d01e45b65c8e991e2ef56b20a9abd/wubok.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/eadjjaeegojnd29dh2kd60l0mq/65701636979.pdf
    • https://airshow-bg.com/file/68572445521.pdf
    • http://sun-tes.ru/files/file/fiweketulupimaguwikidagam.pdf
    • http://chongthamnguoc.vn/img/files/jameju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cercle+et+tableau+trigonom%C3%A9trique+pdf
    • 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_off0000df20.bin
ae7d8cf4baf9062d9206459b9c71ace911782724809279e54a64a2566a964aa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 11364 bytes
font_01_sfnt_off0000f8d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 16792 bytes