Malicious PDF — malware analysis report

Static analysis result for SHA-256 271b6799d14a9733…

MALICIOUS

PDF

131.2 KB Created: 2021-07-16 07:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 04fae6900d15f0e73d6ae91decc1b3aa SHA-1: 4822030daaf70d808a7819af766c21aa8543e24f SHA-256: 271b6799d14a9733372cd736b5ed7114e2e1c598f240cf397ade64252ec2067a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress upload directories on various domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608985fb1c4e0---dulinuwolami.pdf In PDF document text
    • https://weeb.nu/userfiles/file/18118484387.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec952b52aef---30657013452.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcded3196---dadajipavonovebax.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608423d3bf3a7---supuxazaget.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/17226412719.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcc04cdc91---xofiki.pdfIn PDF document text
    • http://djapm.com/userfiles/file/toruniporikujise.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/boniluguwuz.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607419dca827b---zamepawuvidezad.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/sidosepikazote.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/sikomojakemo.pdfIn PDF document text
    • http://turnyras.lt/Files/file/jelinoxuzamitogil.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/pidiledo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ea496588c---tagado.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/vituxapufizubidogut.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087b96665d95---20143630415.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/92e69ee805e30ef50a39687306da7da9/badafusojamulalizimodilaf.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/63588678164.pdfIn PDF document text
    • http://cichanski.com/Upload/file/68232136456.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/zizikejagib.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd8d2dcc8f---wabexunakeloredomiwa.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eef818c04---97584925299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+a+bucket+mcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18679 16348 bytes
SHA-256: fdc3f250e16d4eeaac0151c08e1678493ac6cc67090af3137bc700c4cd553891
font_01_sfnt_off00019cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4E2 19024 bytes
SHA-256: 00668ed44d2774ad3ced02145e7089c7c4437519e3b0c57b5a015141265180a5
font_03_sfnt_off0001e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E813 10288 bytes
SHA-256: 53942ec1003d1fd08a576490646138b2f242ba721c5fc00cb42323503e8c27cb

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