Malicious PDF — malware analysis report

Static analysis result for SHA-256 89072110f5cbea81…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 08:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86dd6d3c0917fb09a97d6f5b60438e64 SHA-1: 5af8be251e94997c6589fa8b724404d9fd3d55f2 SHA-256: 89072110f5cbea810c1f20d91f5dfc8b9474817cac635ff9a461c9978563e5da
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URI heuristics and the compromised CMS upload link farm heuristic strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

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://cnmrobotics.com/files/files/4467682701.pdf In PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/61718567370.pdfIn PDF document text
    • https://serka.com/serka/upload/files/81336166822.pdfIn PDF document text
    • https://energooptima.hu/upload/File/tikenozulumalagage.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742e26a43c2---rudoxetibinudil.pdfIn PDF document text
    • https://avela.md/userfiles/file/jokepo.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/df45e2d6581051ee8cae02c081b72c2e/68366307682.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/ridamike.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/joxosakuvu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c274c2874f9---novowurisokidipiwopamezer.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/vosasuwijejutezuruladufez.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ko8esegebovi0sjr68r1sco1le/fepagabemivajugemula.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/41842708813.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/vinetakivipupujunuw.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/41426773922.pdfIn PDF document text
    • http://gabortech.comadmin/file/dajopijuwov.pdfIn PDF document text
    • http://ashioke.com/images/library/File/zilutatovij.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p92hou8p3bmrmonqplbce3ors7/zixerudosozobopemuno.pdfIn PDF document text
    • https://servauto.fr/img/user/file/41255101790.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/be51aa85adc01e3a0275147b3451f52d/jeruluf.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610599778e6d4---xevopifenudaxazebirekezir.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/24463554530.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/52820537953.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/82071210559.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/52964740069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=muratec+mfx-3510+parts+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 19420 bytes
SHA-256: 52df1954b703b3363f42531801ddc4df1ac8289fc16353180342096f13222c95
font_01_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1