Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec53d3a4dd734103…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 12:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 674cdaef337d96770e2ec023bc40324e SHA-1: 1b7c929ed0861e3579e0a51187ed68563a62e8c3 SHA-256: ec53d3a4dd7341039a4173e9848a2778c1422ee477c675dd9e019a723f4e7111
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of these links suggests an attempt to lure users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c62ac29e04---82603854137.pdf In PDF document text
    • http://wish-pharma.com/upload/files/gebitexovisemapupidib.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/jirosolomawe.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904094236.pdfIn PDF document text
    • http://bamor.org/userfiles/file/69185820568.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/56751431824.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/raselekuzufisoxuri.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/43522072794.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/80201524936.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/88384854203.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/bosipiliragibopi.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/39073015261.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/zulokejurinodisibebukekas.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614438981f24f---43836576890.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/17235236487.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/85231660956.pdfIn PDF document text
    • https://faceless.me/userfiles/files/25063257345.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/87670437613.pdfIn PDF document text
    • http://topflexsports.com/uploads/90470285945.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/nukewif.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/27402784545.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9df47a46c14db0e046ddea0b54d0c877/72400534696.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/badod.pdfIn PDF document text
    • http://peoplefoster.com/pliki/76447704982.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/8050173559.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/duxivetenoden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=can+i+play+mkv+files+on+androidPDF 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_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 17128 bytes
SHA-256: 287d320d8b48a130b3a623e9949608532c3949b096de93cdcbfb2e661cb2c2e7
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 10864 bytes
SHA-256: 3d58e7343f8f86de82ea8c7b7b129ad772fcaabc2e71c8f068a51457586ab50c
font_02_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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