Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ae32fa1c4f665a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 14:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d494ded84616a8c99e0b03e786ce800 SHA-1: 5d1138033b7357f569c7ab2d69ba6eb37769e366 SHA-256: c0ae32fa1c4f665adc21f7939d3152125cee72c5653d7daff954d5cc9900296b
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 sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=jam+wifi+android PDF link annotation
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/624b262700429d0010bfdcfa517c00cc/pemobofanazemagadaj.pdfIn PDF document text
    • https://porfic.com/fotos/file/kemevurul.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/xatib.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/buruluxasu.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/wiladako.pdfIn PDF document text
    • https://orrizon.ru/images/file/lazesiraxiro.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141177fa50c1---wavilezuxivibanaduranedav.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/gononuk.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337ea6ef7d2---29976934526.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/56648896632.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/55666770679.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/dedopesizogodiwubazigakim.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/98056751777.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ge9n1ememrh3hveq5a214uu01v/87794258899.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/14187352557.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/86547726531.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/valujusul.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f065744460---nuwuponipojofagizire.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/18654239821.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/vajitasaminitew.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/levamirusulisomojewet.pdfIn PDF document text
    • http://carszana.com/image/upload/File/37351104268.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614154d9425c1---98847548665.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/98164105626.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5c4746e4---1373797976.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/tugab.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161350b8cac4f8---vegure.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/60243970751.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_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 18152 bytes
SHA-256: d80076e4e6340311077f4899a5f90422f87d54528d03f9d79b757af0dfe22b6e
font_02_sfnt_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 10148 bytes
SHA-256: 6ba5d0e49a23cf2b288fbc89f614c73ebd980dc0b2c8395c4d6f074cad29e4fb