Malicious PDF — malware analysis report

Static analysis result for SHA-256 4716ccd3a96c2083…

MALICIOUS

PDF

77.9 KB Created: 2021-06-25 19:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba89b48b60e5c15b849451d77067f00a SHA-1: 6eb2fbaf5a9caef5703cf85f8e0f45505f52e6bd SHA-256: 4716ccd3a96c20839a87e9101879109ee7b01727713ba02218b2c2bf20cfe924
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true destination by using disposable hosting and redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5366

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://whewfamily.com/clients/12004/File/15106098204.pdf In PDF document text
    • http://mientaytourist.com/uploads/files/nuxisinenulopofipesa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608320916527e---dugijefigodumow.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609912dc77641---buxonezezesoxexotokawap.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a10506ae---14662069782.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/66030187925.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0fd687bec4ce129aa8a8f1ea83b8cff9/zejexizosozepibelenasar.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/wibivofakovak.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/wukiwagivop.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/lmokemvtaal412fodhngl66akk/kexosikipixozak.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/2a031a862e0c8e4337d6c7d7de4e1e94/14694305904.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49320d621---womomulo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/33201568914.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/wanuparasawojitubupiri.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9df7e5ed6---13023262524.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb5c0a0bd5---8397713636.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/45972742498.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac42259ada3---najedejaziferavigebosomof.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3f1fb65caa0ad16f8903e759d83cc2b7/goxok.pdfIn PDF document text
    • http://nensi.si/upload/file/dozoxevunu.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b411e4a3e80---fodesegazivoniwaxarega.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/i1nksdiknnetfihqi5vr6evorf/wesimijobekogufuvus.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2e2bda6691fd5480551745eed71e0883/fetozipajoren.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=physics+semester+1+exam+review+answersPDF 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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10752 bytes
SHA-256: 93bd8bca1f1bbe78d934439baea65d4828b6b324a9b5be8dcba4b5dfebe17896
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 17360 bytes
SHA-256: 153673482a97760ee07c5a9f98bc952296f8b45393f392bdfe921772b1d2fe29