Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e992429e4a19a43…

MALICIOUS

PDF

93.6 KB Created: 2021-06-28 00:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9b8ae7bc01a3112136752bd5862ec112 SHA-1: a028be5b3fcdf50a70fbb7b36434e79f6e3be772 SHA-256: 9e992429e4a19a43eeb2dac574b50a09d132af31b0f5d0c663eaf5df3579f8d8
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting other PDF files. This suggests a multi-stage attack where the initial PDF serves to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/pjto2b7hqncq3mt6e196h0cofv/kulirit.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f79ee82b12db811e02d027433a901211/nadabiwileduwajubat.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/46a7467ada019a736b54b55d1c2f9c1b/92279929839.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/iqnfuo91cki28315fmjffnhrvv/85862669760.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091305e0aac6---lubisetesifisujijuvok.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/m3kpb4hcstro4oo6ks742tg6du/kaforo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8c5c56e2---90290126927.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1b3a9d27e4cc8f33da66680cccff581c/wufabu.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/mugotiresavexob.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/fl5jubppnpn6ud61tgnbm60j0g/56013664418.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ed44ebb0---sileginuvisujolukawuf.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075861f3b321---37061529872.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3691f1ab22bbf5487c96990021a2ab9e/wuxujuzazazedegivas.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071226f0d6c1---62031964276.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/v1g1i3a3uc1dff637vq0ifathd/45850467700.pdfIn PDF document text
    • http://bptramptour.pl/files/file/bonupemulewebojopewuwof.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/13600324681.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160926170446f1---78251431111.pdfIn PDF document text
    • http://dentherapia.hu/files/file/78938559990.pdfIn PDF document text
    • http://halmar.info/userfiles/file/42592007194.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d22d6d5046b07334b1f8bc5e5821e961/91983070080.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/dqqgak886t91adrls40oohipfm/79565070884.pdfIn PDF document text
    • http://proxima-design.cz/files/file/ribanezopoxizi.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/26855867296.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/xabami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=blue+gold+laced+wyandottePDF 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_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 18204 bytes
SHA-256: bf56100f480bbeb059f0e85ae0705155eff17a51c6bf1b5326b9bda909314304
font_01_sfnt_off000138de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DE 10536 bytes
SHA-256: 0037da82733181ac9c042fbde1a815f5b975e24c4310b1f6f2532c4a22cba4bf
font_02_sfnt_off000150ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1