Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c6033e81c0ba50…

MALICIOUS

PDF

119.9 KB Created: 2021-06-20 11:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 580d3682d4128ee699380229ae0481c9 SHA-1: cae9bdee255b965227ee3218027003d94c28880b SHA-256: 54c6033e81c0ba5064022642b99dc48d9855b9b5f18a97071a1fdce5a23c0188
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download additional malware or engage in phishing. The document body is heavily obfuscated and appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e45ae9af79faf24ef45d1d85fbdea354/gijilukomalifapem.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16093d6a7b996f---jifasivoxotexefu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/09db12067ee02938eb0815623c9ba9a8/5908106101.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d004591880---11085714927.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734f3e1292---xegegudevu.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775da1a2477---sovigejapawol.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/molekumagiponadosajejoz.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/s4j0tfs7cf2vq7t2m3350pq18k/98384241547.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c541fd8f8d---63066491453.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/mmimgu4ctgm95ljvd7ge1euuid/gawekajesil.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0d968696a9ec8c98e925688ffb22b43c/pejexakodonovudore.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/7414599385.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1fc2ad0bb9bd5948af2be30058feaca5/gokixe.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2f96796e---sanuzex.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6fab30184---92418192389.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/eee4c979e3c7068c4e1825467d713e30/93233737431.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/28587292586.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gaganendranath+tagore+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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000172e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E2 5124 bytes
SHA-256: a27980e660558830a5ff58f3393c359f4a68950f94bdce5fe02212e4b5d5733d
font_01_sfnt_off0001844c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1844C 5172 bytes
SHA-256: 9d70f3e68927a177d7794a26bf36c7dabe6f041b8ff4e81a2ea4a0b9d5c96d44
font_02_sfnt_off0001952f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1952F 12096 bytes
SHA-256: aa5633540b00c05c2ebc9c7167da56f0642a334a5ccecc913a2c0605d49d12aa
font_03_sfnt_off0001bc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC56 16172 bytes
SHA-256: b6b14b20cb7f68c9745c0e755cdf17ed5e1c072f44a65a23069e6edae17d61ba

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