Malicious PDF — malware analysis report

Static analysis result for SHA-256 176035bebd67206c…

MALICIOUS

PDF

85.7 KB Created: 2021-07-02 23:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 237c03c7b51db51c2c0a133139f665cb SHA-1: 97b325ee52405c1da8e04cde797586b87fcf8423 SHA-256: 176035bebd67206cfec15cc0effeae508d0e59d45c6d00d6e70c03c38eb7f7f2
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs suggests an attempt to redirect users to potentially harmful content. While no scripts were directly extracted, the structure and heuristic firings indicate a malicious intent to leverage external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://anhbanglaw.com/userfiles/file/lepazowisumevorenizuvajo.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/fk0manus2dp44g195fr8tfc63p/16588361704.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/maxig.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608243da8167b---56932839066.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/gbos5hp3te2pdg339unknmf5tl/71659710482.pdf
    • http://alhouti.com/userfiles/file/wilonivudaxivafizixaxuvew.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6198251dc9---6605747835.pdf
    • http://avision-italia.com/userfiles/files/43548332821.pdf
    • https://nestsearch.in/admin/uploads/file/visanugadidifezapisemeno.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074ffc2d7468---borujumorigijovaseve.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078a08a63cb0---vijotasawonofidovi.pdf
    • http://neonatal-surgery.ru/userfiles/files/99487970194.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9c41489afe0c77b581d16af1b5cf37b6/dejadobojipinogejewute.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-14/20210514132226349319.pdf
    • http://akkoryazilim.com/userfiles/file/potanunutegagubomo.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1f219202---8776928118.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f95770d0c4672b290368765625850b64/22308549688.pdf
    • https://mimpi1pusat.com/contents//files/kigur.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a8502ef77---rivubujupujejerabubuwap.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hpebm0mjgj4j2voc30ela0dpi5/50570553994.pdf
    • https://imagebeaute.fr/userfiles/file/26147647494.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/pflvqif6jdh9ub2915kmojnenh/fojisavaratirenigakagewa.pdf
    • http://amajyuku.com/files/files/64822933743.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12aca0022---33326968184.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/654f4d1173328e842642393c420111d6/punepa.pdf
    • https://atl-50.com/files/file/jikofobomuv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pitbull+puppies+for+sale+near+me+cheap
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/164c0272884084a8c1631f00e797ef1a/dubidanas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9cb.bin
017bb861284851f18657a3e70bef9f506279e558c8b6ac4ff98c2897ba00f802
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 10984 bytes
font_01_sfnt_off000102da.bin
d7ec3172e0727e5cb8dfc3ebe87c0126e1c1525d2e9af0473b4caeb7a46cdd48
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 17640 bytes
font_02_sfnt_off0001312e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 16792 bytes