Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a63dcfa19bec41…

MALICIOUS

PDF

67.0 KB Created: 2021-08-01 20:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4553ba603d27f16f7b34fa4167f33dfc SHA-1: be96c6be20a5e9fe63e566f221b14ff8c76217a3 SHA-256: 11a63dcfa19bec417401cc5f16fc58f4d207dd68a5f196048a2af8b8bdb91da9
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as a distribution point for further malware. The document's structure and embedded links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9143

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 https://crewmak.ru/uplcv?utm_term=how+to+light+a+richmond+gas+hot+water+heater PDF link annotation
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/41cde2303730482a0cbea5814ffbf245/49410329141.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/narolijedesof.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043014184233.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/losotigukelipadaruzorej.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210702162524508312.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3f83363fc6dbb3bb64ef695240f9302a/xasulojawarotixixut.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/feaf5bcc04700595fbbbcc5045c53309/62695753995.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/5e1cc7b62274ad00cc9ebf6fa76ca3f4/putanobibemuzakomupivozo.pdfIn PDF document text
    • https://parkettworld.com/upload/files/12333071836.pdfIn PDF document text
    • http://zxsolar.com/d/files/44557650983.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/vegawibosejezasusiz.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f8b5444b41233c9eb833e529215b2a87/ravasurunokirajiwokope.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/77514536772.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/29l289ehbtkj1lt6u8au9k8pq0/58833132403.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/117e551d7782c96edcd4924f473b4245/nidagakuxogulijewupolo.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/pufegevobizopaxunin.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/sudasotoxufabim.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f774f74d01---70510703649.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105260302522460.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/5so9sqbhph8mvtrsueqghhkc70/50494742565.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j7coalogs8hus0semhkk5dva32/68600795142.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/newakopinagisememolowu.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2e35cb9c186669ec51f3f82cdb6eba17/zatab.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/gapifabilowibem.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1