Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9166a58741dab03…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 05:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cba91f2c5af714d20ea13014923f82d0 SHA-1: 3655de402cb80386b0a6746fb320698c44140941 SHA-256: b9166a58741dab03e80db5efb7e15b6efbe32e0ff67dd0cb3d24b5310473397d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or malware downloads. The presence of external URIs and link farm heuristics strongly suggests this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=the+handbook+of+technical+writing+pdf+download PDF link annotation
    • http://motorlustor.net/userfiles/file/92693331115.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/30704335707.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/fikorozef.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/najagekesibas.pdfIn PDF document text
    • http://alkanboya.com/files/file///11184483863.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256d020081---wefexugaboz.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbdce46a1---13271602748.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/51136142970.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/regovatolexi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/l2pkpl2lp8auv88gq8k2jhd64k/71965897302.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd413aa750---mubifefod.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ac863314---lazokukoxidezivorafo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/04175943394a9cb807374df34c73118c/nebosemozifoletofijenawon.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/56b9d355d0d8abb3c1e8f44328e1c9cd/tarulikivojudovegekez.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/31534943167.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/dodisam.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/45348620112.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///47005399474.pdfIn PDF document text
    • http://espicycooking.com/files/file///fapoxolenelix.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1560895515---64604690189.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bda0427ef3f90e2f10d2a9bec8867775/42955257858.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/32845986166.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51d6131c4---ruxamawolugaluvot.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/poxej.pdfIn PDF document text
    • 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_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 19184 bytes
SHA-256: 89acd45db4ff854ad6e5f5d16f0cfa997fd839e964d037d557a94543b1255c1e
font_02_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 11012 bytes
SHA-256: 7c92bd0e58fef6412763a6bf7813e152f4a58ab100d1b92a96899c35cc648b2e

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