Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a18aced7d952980…

MALICIOUS

PDF

72.0 KB Created: 2021-09-04 22:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0bd8595d13abfa76df375e97f9c65a69 SHA-1: fe5eccb1d9a2e6faf93f9da1a34a4abf837f495f SHA-256: 6a18aced7d952980b65c57f7dfaeaf72eec169c6f83da0738baec05075b577b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to lead users to malicious sites. The embedded URLs and link farm structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://synerhu.ru/uplcv?utm_term=thermochemistry+calculations+worksheet+1+answers PDF link annotation
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/3384041941.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/lobofadimokoniwekewos.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9f25a47934ede23aafd66d1149978c3a/96951943163.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/57772528786.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/gufigodovimamaravirepeses.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/87107823081.pdfIn PDF document text
    • http://oodow.cn/upload/file/210708080506874305aggxvhg959w5.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/23200488874.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vunepuxug.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/fosimagojotutixomatilovud.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/33351443690.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/78718742060.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/543962635.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/8317385231.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad9590ceb---sujajusalavij.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e96ab30c9d207f0b613d873ea8ad3bd6/27848662066.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/2c2dbc265h98bpfq62fkfdpe3r/32221055021.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/21803126001.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/579cfd522c0cb1728a1afeff77a7934e/loxazemetesabejotewevim.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/12f4e6fbaa9699f01789fc0482e6720a/ponuzuromepemetagudaw.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/wuzemibifitisenaw.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_off0000b8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EF 15812 bytes
SHA-256: 92f150f0e7655cb49f6a36572d064ae5a98f8fd6b884901d42f58f1acfae9383
font_01_sfnt_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 10904 bytes
SHA-256: 7071b9446e212f2c22be47797125a8ba52296d862ad608e26706bad986ffb278
font_02_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1