Malicious PDF — malware analysis report

Static analysis result for SHA-256 229811fe66148f21…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 15:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dac0045095c4ff8a4f22bc67cbc56f7e SHA-1: 3ea805d2c3b31487d21c6239416828d1163ffc79 SHA-256: 229811fe66148f21bddef6a16721fddff79d6c012ca89645818d8718f2546745
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous links point towards a tactic of overwhelming the user with options, all leading to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/qih09c3n48rvv51b81aiu738kf/15888796472.pdf In PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf681b5792---9766434399.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/safezunuzajagepovu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/96581866051.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/jezona.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160845c783d286---28459768440.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/migabinadawodog.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3782c40de---59826835563.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9a1daf4701464dedc87e9932e362a622/92147731795.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160998d31b22ee---nerefetuxulaki.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4d6d135b7---vadiv.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/rugirubitow.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/88948094521.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/mudisedenitanemufub.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-29/20210529113148221608.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16090820c5b870---kuwurogewegajovisejokad.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zulidef.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/kamapedufuxa.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7t2g7loh7cplsvu8rk0kpr8tgb/lazopekevomomefuduzozewur.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b04d14e31f1---tatumorumapu.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/fumipokexowiwodotakus.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/jrkd869g6g6ocvu6fp2ffl8is2/72851808500.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/615caae1001f2fe7e91a0e24fd2ece9d/nibuw.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/ganekemituwopisoves.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=direct+indirect+speech+in+gujarati+pdf+free+downloadPDF 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_off0000c0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 11216 bytes
SHA-256: 4160a72aff63e1ff9e6223cec7f98a31ba1b3d27406b434ccde58256a8e7b8cf
font_02_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 16980 bytes
SHA-256: 758b755cab2a83e7f8a07ec609d84424a04a8becaa7de43e573fe1349d0906d5

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