Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc60aa61b4df207e…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 11:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1111211e300c333ce949ccdcb11aef3c SHA-1: 8f67a85d506fa08aad112eac3970cef98a247bf5 SHA-256: dc60aa61b4df207e758d82ea83c79f57f014a1e2a653f26a131257d9fd0b80f0
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicated maliciousness, and the heuristics confirm the presence of link farms on potentially compromised infrastructure. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f3279544b---68589748876.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f48bf005b---63710638292.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///jifilokakomamijafafe.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/pileteku.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/85489579273.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/tumumo.pdfIn PDF document text
    • http://arslanemlak.com/E/file/14254409295.pdfIn PDF document text
    • http://fygl.net/uploads/file/180700401711.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/kulolovexak.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/pukajixuradaf.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607593e760fe7---48281588664.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9ca32240---sezalatukupojavidititumup.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a358bfa2202---55948199974.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e41dc2303---lagazobene.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/21270296680.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1f7812c496993d5da2f7c40a699f1b78/sesar.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/fotoreganufevifebif.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/26880174554.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/28721625294.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5342850651---64622137844.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd0d8ead6c---12033970291.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/komolaxuponixarijopap.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7d515c13---21327006096.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xitodofiwali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=baby+diarrhea+2+months+oldPDF 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_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 17276 bytes
SHA-256: d550b156864d94a67cd79bf1ddd9abb3e4717a3fca68828882925580adcaa082
font_01_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CF 10940 bytes
SHA-256: 8e880e955c9a1a0380f7835a726fa411fdc5284f8e7d0fdd0b648da3a863d118

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