Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f9b1c2551d33fb…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 01:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4510976c13ea526583799d516e0c9ed SHA-1: fc3b3de3706ced7ebb2541468940945b068a3b58 SHA-256: 99f9b1c2551d33fb0ea4f03d54f36347bb403affb9c412f4fd7d8cd8c185009e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and multiple external links, several of which point to compromised WordPress upload directories or disposable hosting. The presence of embedded JavaScript and the nature of the external links suggest the file is designed to download and execute a second-stage payload, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7453

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ambulatorioveterinariocigliano.com/userfiles/files/kubekoxeragekojej.pdf In PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/xilubib.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/35649087482.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/66393625602.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbf5765e88---vidomijizexalofakabaxurun.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/xokizutu.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/51950198693.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613476255c525---91830912774.pdfIn PDF document text
    • https://bor-diing.com/upload/files/89615153727.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/86311113066.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/72507661028.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a8d062f9aaab6b7cf962e14664fca450/bimevanejalikodo.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/11807136241.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202196926393775.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/punuguxavutisor.pdfIn PDF document text
    • http://ashioke.com/images/library/File/78584106764.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/guvibuwekefaxumudawu.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/17898691547.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/purira.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e50c8517---nizorozuxizejutuposo.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/turaliwesajekofezokod.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/26436874170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+loading+viewPDF 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_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 10292 bytes
SHA-256: d01c512e60a213ba2b8f3333d65972d3eaafa8bd1160bcb1865b484b285a7c84
font_01_sfnt_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 19696 bytes
SHA-256: b8af924f31068b73d5da8a6508dc67954199671f136f37e40f80662738c4fac9

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