Malicious PDF — malware analysis report

Static analysis result for SHA-256 30e43b9181dee072…

MALICIOUS

PDF

69.2 KB Created: 2021-09-06 02:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d0accf41619f2b215c88db29e605453 SHA-1: d27794c32cf6f9ec36629d539051f59ab549c170 SHA-256: 30e43b9181dee0724bf865ae9b1b546964dee15bc69a9bd79d79a69214a51bf8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF contains a screenshot disguised as content, with embedded links pointing to various compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2q3sb8id2jiklnkehnlki70fkn/xamadiziviposofiwup.pdf In PDF document text
    • http://slkuang.com/v15/Upload/file/202182870152906.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/78793207368.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/warubitowas.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/91474621221.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/40a529193a639afcca129d6d8895c02f/geradudozugudegi.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/bulifusop.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/guxam.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0ok7mh7plco5lq30aks7oijg4r/mubiridoril.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/bewesoxegevokerinevaviz.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ecvh73iogm10nqvqe30aomb5f6/kajaropa.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/tokoruteval.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/60364013736.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ama3pfpjtfh7ttnj65khtgupbs/62130989411.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8nuqpiebantg3p8jr92o95df0c/89044452062.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/08/202108231513334398.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa02b783633---faviboxagawetilowere.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610f242a36bbd---25514499035.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607094d669657---19861582700.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf2842a4fe---liwiromazekitugatapinug.pdfIn PDF document text
    • http://computerdoki.hu/user/file/ziwutilowibuf.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1628620054.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/93026a476e014288e5ca87ca3018ed88/26356790553.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/2740188286.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/tosas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=number+worksheets+free+printablePDF 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_off0000b35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 14052 bytes
SHA-256: 617b40399d1cf409cd5067908b95228a73fd19679f4e6e538201756acfa38b26
font_02_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 11020 bytes
SHA-256: d3493057b2694b8ac04b8e63c0932ee6d575c1947cf0d206d0c35815cbe58cd7