Malicious PDF — malware analysis report

Static analysis result for SHA-256 843918c651a301e6…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 19:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85e90a46f0d03ff42aab3b2d6bbc5653 SHA-1: 18ec346a269a9d8205fdfec8719a7e01a081eea1 SHA-256: 843918c651a301e6007ce53bbc7556f3f5768d0c861e1b5ed24ccfda5ee33040
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as a lure to download further malicious payloads, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/cr74p9lj0k8f83ln99dufgksj2/43365084392.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/444c3f384c8d5fd9f0b1ea9f33effa7a/47037940042.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/suzufejuminujutupa.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/70055659516.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c16ef1b8d54---podifixafowidew.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/danipeso.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/19124805388.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/35639012657.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2ef4a5c5ef0698277ec6348a8997a151/73040532132.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/kejitemez.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/67148040689.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/2042338209.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/fkoubh19352l6dbl37fqkk7a1i/waxufekidimani.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/74933804238.pdfIn PDF document text
    • http://kustari.net/userfiles/file/36228461705.pdfIn PDF document text
    • https://ayurmitra.com/files/file/98368364192.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/bidudagepusibopekeli.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/zokudi.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/vevalitekebebepanasavodom.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/2662845336.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/88081548498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=me6019+non+destructive+testing+and+materials+important+questions+pdfPDF 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_off0000c54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 17636 bytes
SHA-256: 475ee0c004efe0839fc3dcc596dc1367852835ce929eb4f85637070d0200926c
font_02_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 11776 bytes
SHA-256: 62ce5232b9c29059f11499d2a05e452cfabb12862804f8d7631839c0f111439f

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