Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfaf7d3b0aae3c8…

MALICIOUS

PDF

74.3 KB Created: 2021-09-13 19:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6c0b795c01f56a765eb399469490093 SHA-1: 51927239fd2f0928ce3fdea024644ecca16ddd29 SHA-256: 5dfaf7d3b0aae3c84c6515998a6c7342707b462f3dd4679ad3331ff651276635
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://sooclose.eu/upload/File/ritij.pdf In PDF document text
    • http://hasomedia.com/userfiles/file/bajag.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/3831468925.pdfIn PDF document text
    • https://trystsalonri.com/images/file/62290785610.pdfIn PDF document text
    • https://phunhai.net/upload/files/49145847961.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/58004589878.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/66584938877.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7cf73c6c---73357048787.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f23b01864b---fiketuxataramawib.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/dasevexixovewilija.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/bosivebewawov.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/10277321559.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6aacdcf56---65141093981.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912003420.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3dff48b05---54007076223.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/gusegixikegiduxakazi.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/71810412924.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/45729929667.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/71777345170.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9a7ba660cf24acd2bf1e9d2c10d2baba/povowavikuwumivuzox.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/48341436963.pdfIn PDF document text
    • http://metall-press.ru/files/sefapekeladexokubed.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/96633904944.pdfIn PDF document text
    • http://amandamaitland.com/images/file/2066740717.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2bd6f1f979c21d02721ffed518fc4f6b/fevikotowig.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/tojol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tasha+cobbs+he+knows+my+namePDF 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_off0000beb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB9 10552 bytes
SHA-256: 31cfdbde3ecf66a0712663c0a5bf962910e9f2d9dfa38b1d0e94191c9a5f2669
font_01_sfnt_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 17404 bytes
SHA-256: 9090ed4e0032e99b4ec781741772b51a2835f873599fe5a85820e7f5a42d8736
font_02_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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