Malicious PDF — malware analysis report

Static analysis result for SHA-256 0090f8211b2baa77…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 00:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: adf454dd992402d1ffb7b4de7761a57a SHA-1: 09b288ebc971a4cfa4ff48822a691b25aa0ece53 SHA-256: 0090f8211b2baa77923a19238944ea7b462bf1af5afa35b53ec9099064068fee
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded URLs. Several heuristics indicate that these links point to compromised WordPress sites and are part of a link farm, suggesting an attempt at SEO poisoning or directing users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://catamma.ru/uplcv?utm_term=studi+kasus+pengambilan+keputusan+pdf PDF link annotation
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089be558db61---36510711264.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/28371731547.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ae0fa0da3---37529103691.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094de66e78bf---80965363902.pdfIn PDF document text
    • http://yuha.be/_files/file/79725724201.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/poxazigudofodanobeni.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/lapunobofeboxugoxijik.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/lumuduxufugureraxapisaw.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ngj4li76qe1rvemcfn8hd688s1/7162333039.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/mkjoogui58ighd6giesadm0j56/73833844958.pdfIn PDF document text
    • http://freetds.net/userfiles/file/guludozavupowosajojovew.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e571859ac78---zaxepulofajaliwotiwe.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/nivebimebu.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/36018392440.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/17804941954.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7ff9aa07a---99422009918.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16114f0953868a---85056092467.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/xopej.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f84d4a40effadfcfd29070e3336a9dbe/zanikegomiwogixiva.pdfIn PDF document text
    • http://abwessex.com/uploads/files/bojesonukipidox.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/wuzeza.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/kagolon.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/vefatokipeniruzasotem.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/23056818214.pdfIn PDF document text
    • 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_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 11028 bytes
SHA-256: fe1c86e686e8cb303da1fa63f8a82d178d96e43942fd9053507893d7c3a804ee
font_02_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 16588 bytes
SHA-256: 74abdca7bb14f541a1caf76a3c02c8bc997bbe4df05b836bf79da089a885db97

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