Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec27869a1fdb4d4…

MALICIOUS

PDF

88.4 KB Created: 2021-07-05 18:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10b62ce3ae7b9938355ccf4dacca5847 SHA-1: 4fd216f45d448805ee66ca929878f8e5b35ba806 SHA-256: 4ec27869a1fdb4d42f72d9c37a6dfc65ee547d9b25feb5788c9f13ae490d386b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://bahtiyardishekimi.com/fckfiles/file/50709345177.pdf In PDF document text
    • http://gabortech.comadmin/file/78708186270.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984cf5c6f79---nasoxusire.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/dag6t0of5hh2e73sqv9chjei7h/21633023466.pdfIn PDF document text
    • https://bselink.com/userfiles/file/mikutosumuxelelepebopawim.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1bf1c8f07---petowijenaxogogude.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/viveduvinelajarumuvev.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/28005645446.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089608368046---rexizolibidezo.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/tosifalevola.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/fikazisutik.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f22e2fcc5d1207fff834be6b582db5b6/lulikedobewurarajepip.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160988fab497ab---zuxerurexotupinudigod.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160aa685481389---buwelotul.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/aalek6s89em9fkr0f9ncm2qsg6/45731964015.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/60gtc0aeeoml20i6k53tbq58ac/bigejofavasupolipili.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/darir.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/61402069516.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/lajebafudewul.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b806c24b89---46754056078.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/70741119946.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/rososisulojufanibepak.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/10qeeid0g2isa6ioomt04e5gjb/jogebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=10000+divided+by+8PDF 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_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 17292 bytes
SHA-256: b67107438d2efa3e78f5a5b87adba968389b71ea5fbbeaecbe74265019156971
font_02_sfnt_off00013e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E23 10048 bytes
SHA-256: 56e55d771fa4472f5553d87d402a5668a3de9c1e0d7ada777015cf545a692c5a