Malicious PDF — malware analysis report

Static analysis result for SHA-256 054088370b4d22e9…

MALICIOUS

PDF

103.4 KB Created: 2021-07-26 14:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e46495847b19edc94c6df060c73c97aa SHA-1: 1ef314919471880bb1f5d5eb6b451ace95b59644 SHA-256: 054088370b4d22e9199eff50f424db7f3a9c2db719a8b01a19fd777424073c6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/oj4r8ii56g1cqubjg2jj4krch9/96957452399.pdf In PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/xoper.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/95128019900.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef8f7de5a---45030929138.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ef0ace10a---werifa.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf433e364---50710210850.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985bbb2785d---kofelimu.pdfIn PDF document text
    • http://edgecs.net/documents/2206602296.pdfIn PDF document text
    • http://starsunited.at/upload/files/bilegan.pdfIn PDF document text
    • http://axwelindia.com/uploads/46014059416.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/fuvukukukeregikiduzo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ee415555f---gerikefusekonojiri.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996e41252cd---tafukepimoxa.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/25440758366.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/95663517749.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/23cb6c2caa4cbbf0e688b4d1cf80aa6c/fevemexiduzorematufivi.pdfIn PDF document text
    • http://alkanboya.com/files/file///pokejofozebixatekajetofu.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pedazame.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/94079384095.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/ziluladexonizem.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/gan9tmo4253icd4i37c5th56j2/86953838328.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160928e03c7fef---jubiwajusugoribakiz.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/vejobovelegewojasap.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0f57b9697---32494693926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=new+english+in+use+eso+4+photocopiable+burlington+booksPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B09 11124 bytes
SHA-256: 9008ec8f633a9cc7dc5d017f8163e35acca2052170839ea6068856ea2a5a4ab6
font_02_sfnt_off000144d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D3 16120 bytes
SHA-256: 5a58bd25086e93d985c75a25ed67f4dca879ce5f42e3fed3a71b5bf37e4b09db
font_03_sfnt_off00015a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3B 19376 bytes
SHA-256: c931c9d24e9568041cd4ab1ce2de41ba89c60f310c6c57d4af7879e1afa46800