Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f32f80d255d54a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 20:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64d69a378212038c35892252f5d92822 SHA-1: 0d963fd2c3380a1592b27b8a1b5075c64db82b75 SHA-256: 13f32f80d255d54abec9325cb170d3612984b3ea4190772d2a7cd90394007111
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • 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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/22fc2b4f93edf299cb895c58706ab640/jopuvibigawoxumako.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5s8bb7cqjjm9sumgt036aplugf/29518318415.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c74e8027c---24662009289.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/debodisexibebalinarubibef.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/42778084250.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/36701874153.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/famusetelugixamutes.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/151bcf98123857f13e19f294c9167852/2729977973.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d3573af0---68486034861.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd84c1b2a3---40369078264.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0190b06b716ff85127d1fca4d4fad578/telolaketokalobanidasap.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a5287341a---38123735077.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/66602108312.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/68832207277.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/sefanoguto.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/meneniwadefitiwenixo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/tm3a2qrk9f0eheshh0fbru8b71/bokatemi.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/de12fed9cf5bf6be105d566320c34af3/jipezikop.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304b0c4c0d3.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/dda47348a12e0513e8c32fdfc18c3291/baveduminoromonulusuf.pdfIn PDF document text
    • https://ksboutlet.com/file/files/98055109272.pdfIn PDF document text
    • http://peoplefoster.com/pliki/jofepa.pdfIn PDF document text
    • https://12shio2.com/contents//files/woxuvalarofenegugexe.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/60465445477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chopsticks+duet+sheet+music+free+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 17592 bytes
SHA-256: 085293562179b7d0c7af8910581faba0e9319f2d09163bb4bdc289e036bfb15a
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 10796 bytes
SHA-256: a0d763bd6bee6d3996b9d77893345c5869ffabfc1cce4b17e1f76b5a0e9336da

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