Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeee95c9f978683e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 07:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 64382b999ca5f796ae97851e4e39770f SHA-1: 8a67aca8a7bb1595f93b34a5d213b4d19e5f63a6 SHA-256: aeee95c9f978683ead2eb78a5c81fed9071636a40b3848675b3bc099a337cbc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains or compromised WordPress upload directories, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=solutions+advanced+2nd+edition+student+book+answer+key PDF link annotation
    • https://www.leasing.net.in/ckfinder/userfiles/files/5100700507.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/jukodozukiko.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/74377917864.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/kewaluzawakutuwezasurano.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/ridexatuvofoxizizafane.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffcda3460---26051284852.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/kiwuroresevirufapunatudaz.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/10068170548.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/nirivokeruvuluxu.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/80890573776.pdfIn PDF document text
    • https://webhosting4.net/media/file/80695928069.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/93815424619.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/55246696491.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/7379115897.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210913003635.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/62880293610.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/45a42c0a6df26e5f1375271b35264457/35626608440.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/4699367673.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/51607441517.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c30d09ff---47241959248.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/14edff695af076e11f9328adc14dd6ef/55456053360.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/kikobidovawegaropuj.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/10114641602.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/letetuv.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133588c9514a---29811801305.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_off0000c17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17D 18164 bytes
SHA-256: 1e367f97254b2c6166495e7242aefb9dacac06287f762294993fc11316320778
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 11156 bytes
SHA-256: d811d124a20b424127eb64fd7df81e0a59b674549ed4ee3987ea946b0c5f0416
font_02_sfnt_off00010ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1