Malicious PDF — malware analysis report

Static analysis result for SHA-256 a181d2b33627e850…

MALICIOUS

PDF

88.9 KB Created: 2021-07-13 22:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b979977f863eebe32d5f216b3bcbdaa6 SHA-1: 1c128e68cbb16d0df9bb264cf3966605da77574d SHA-256: a181d2b33627e8501b4817531bd5598310bc1bda14ffe74f1e1e941089fc98c8
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The document body is unreadable, but the heuristic firings indicate a pattern of linking to potentially malicious or SEO-abused content. The presence of multiple PDF files within the URLs suggests a coordinated effort to distribute content through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3mhvcdsrsv2gr3t6i2dtcueoo1/14251445552.pdf In PDF document text
    • http://blueyee.com/upload/file/191917433005.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/13780661741.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c08e3137---35316120924.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/93188760037.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1ab00ef048365a5e8109c9dc236c278d/newikamefabula.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202164101731.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbde632688---27837051869.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6321c34bf---94860945223.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/6330451c7b8938201dd14f1017dbf788/38772063428.pdfIn PDF document text
    • http://0930actress.com/files/files/29889062507.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/jitotozudaw.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c014bde15d---kumomepikasevugazozomufo.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/98490802826.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/gipitabiganizo.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106291723086995.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6849f7bd0fabe3274ce55bda0bc20f5e/xatujepupifo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/umgi1sj7jvnehoidg7agfn9ifj/juwedusuligujorafib.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/zataduwotefebivizu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/229e928a391ae7d39620b827d0171eb4/zoximokipunaxigulikan.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb21f3658d---luwotajonatepazisuvatil.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/65856493895.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fab41419f9---17709374457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=baby+coloring+picturesPDF 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_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 10956 bytes
SHA-256: 5f5c73b78b9c4c2a2850a6e48fa841500a53e995c7dc35a1c72a46f49e48106e
font_01_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 17664 bytes
SHA-256: d2d732cf8e8de6ac847a5a439b32dab9e89cf5f77258d51e9e2ff41ccc036a6b

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