Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6a11cbb07a2057…

MALICIOUS

PDF

77.8 KB Created: 2021-09-30 14:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 539d4ae5a1fff7dee7df6653934a7f1f SHA-1: 8cd26c4de9cd493ec9930c551c693c049f0bda9c SHA-256: ef6a11cbb07a20576eb9d769cb3fe0b4fc5da2bdaf51331d2d7f3227936197df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs were extracted, including links hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document's structure and embedded links indicate it is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=birds+of+prey+full+movie+torrent PDF link annotation
    • https://megalightgroup.lv/uploads/files/xalilodumopowefejotoji.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/kibabijefababekisagomi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3d37131296fb3cbac38af0394feb905f/rugufiwazasudunamup.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/jabovaduvakakalanija.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab91a31688---gedaxa.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/5706606160.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109071918413326.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/76527359941.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/goguxugitemexin.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/67698438179.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/rajerofa.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/puniworotina.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/27304669839.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/tegaselujefilaka.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/forevaboxisa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143eaefdd065---bomozufoginevobi.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/81255135714.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/56298893254.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/84463358340.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16153dad1a7d97---60719366863.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/10875442294.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/xufimofajeruv.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/wumuradi.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_off0000c0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 10832 bytes
SHA-256: 2cfbe13c76457fd8dec663b2de26903f8fd8cbb8062586553bc146c1b49c990a
font_02_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 21200 bytes
SHA-256: 478c38d8791e96363cfedb8934ee38546a197c72404cda655a270e53240b7366