Malicious PDF — malware analysis report

Static analysis result for SHA-256 65858e47bd24946c…

MALICIOUS

PDF

125.4 KB Created: 2021-07-25 16:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90488fb1427da754e7e5c485a56133e2 SHA-1: fc2922803edbf6222cda4ae8a40acc491d4ee486 SHA-256: 65858e47bd24946cbf9f9b4ba062a462c9b070916d9379305ae87a98d77a5564
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external websites, with several hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these embedded links.

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 http://albatrossmrn.com/konadnew/userfiles/file/59653109972.pdf In PDF document text
    • http://dianacb.cz/userfiles/file/xavax.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/68061087105.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a44a1cab443ab1de59d82d79bac22e0/33830401463.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593d0a2403---47220113681.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f92faf46972---42061190884.pdfIn PDF document text
    • https://roc.mn/uploads/files/79683028649.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc1d6b76a---91014161919.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e08159372a---riwobufefajofewijorag.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a969a371bd4a898322ba843ab3fe1390/jixuzubavefedowuguwabomag.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gnb9h35lijftm0d93vnqdd3d00/89681190869.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3743ccb4---51346372471.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/81932990630.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa579857f---1701260503.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/qdm3rsbf0gbmu6l4egk4vb0b44/11927712807.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/nanigugazojetorip.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e817fed5c39c73d8609b036facdea476/subodeli.pdfIn PDF document text
    • http://foodchemsino.com/d/files/31347491712.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/velixujisidoxevewenedapep.pdfIn PDF document text
    • http://rc-modeller.se/images/file///67427286684.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/22955830406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dayday+band+instructionsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001392a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392A 12468 bytes
SHA-256: 6efb10598161f6315abd15473d2878bf869f0a7ea6d3d8fe0e88122feed7a1f2
font_01_sfnt_off00015fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD1 24700 bytes
SHA-256: 784e04019343ed46002318ba9043d556a965e0722d9bdf8336e50c2c3d97ff93
font_02_sfnt_off00019dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DC0 16976 bytes
SHA-256: a4f6127897fce800fbc454e809862c0cc63798342542145283007baeb24dae29
font_03_sfnt_off0001b57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B57F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001cd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD96 10540 bytes
SHA-256: 9ae8a797b043e6a566fa06bce7cb8e079a3caa20f58ccdcd249fbd2bf7f51cf3

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