Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7c8ccfa8a4deea…

MALICIOUS

PDF

72.8 KB Created: 2021-09-11 07:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b99cddf8ad854924e09e13a4329e3f24 SHA-1: 01d72f69c6e4af20bb55459219632b23c333ba43 SHA-256: ae7c8ccfa8a4deeadc5e0f5c0be61e57bd7e2453433acc32365d23761b425a75
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=among+us+always+imposter+hack+mod+apk+download PDF link annotation
    • http://reklamaopole.pl/userfiles/file/50388318262.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219111116556444.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/57845512732.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/mezibazumafejevevefus.pdfIn PDF document text
    • https://steammining.com/userfiles/file/69048250985.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7a6971e7---kelizaj.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/83870387387.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/99429516095.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/rufibixoregesu.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/rilalexutivuwaxipuli.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/40432223805.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/63057186503.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/79210064085.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/tonozo.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/zereziganerasawekigav.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/85295e3b4ccc25668835e74d69753468/70381699395.pdfIn PDF document text
    • http://partnercable.hu/files/zafobolegixibaji.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/64474430885.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377aad88b5f---dojebawigexifodibomumiwod.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/nimarepojekuren.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/lerugepifefopusin.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/31a8d760c83f75a5d3e443031bf0e6ce/64308122935.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210908065920.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7c754253016081ccfc31f9b71092b5ed/3431888922.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_off0000b9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E7 16112 bytes
SHA-256: a47bd8e07b79bfd2303b1b861a2dfedb21bfc546ba2d9fcb82e37a2117fd17aa
font_01_sfnt_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 11336 bytes
SHA-256: 97ad531c8f89adc44289e72e032e59db5bcb09b43c5f6633a6b1fc726a647b25
font_02_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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