Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a16995eb7e1ce5…

MALICIOUS

PDF

92.2 KB Created: 2021-07-01 10:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b02672b3690e4092f9d8c34625179e39 SHA-1: 0ee12406e7d4219c7339e4da7ec6ecd56a052cac SHA-256: 90a16995eb7e1ce5d7480c982683a3315b4f2f474903e76f57b6b5123206c3ab
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially malicious content through a series of redirects and compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://intervalhousehamilton.org/ckfinder/userfiles/files/tuxazitasog.pdf In PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/e6f5c7adc5cb9f10ce8957282dae0da5/63424111766.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/1409825597.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5bfec00a---lufowesiva.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2446bd46f---60683786570.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/natopivovabarakuf.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075d300dcf62---lapodaviwuzeli.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608623cdef84d---76186510382.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/roxalewopifuzofu.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9a10a736b---tisevipuperenapiguxulomen.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/godaxoguzulozasafobu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097b864de0b5---15148997690.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/4t4rfg6bj9i1v2c9da185mjhp4/61453043939.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1292c4da086100f05c9eed3b0f9bc62c/sepikix.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/tsis3spvs99p1otjvg1hm4j4o6/xetogogiwuluneka.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3tq99uk6b7gnnlq9vrrv8vr1p2/dumogugufuwuti.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c430dd44---58863946409.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/007ade1b63e895848f97657c09603358/taritedamumisasedibedoka.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ba68b30fa58---96642227879.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/dukapotutusunina.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfef8ecdbe---15846493964.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bae1be4a9---zepotufeputofe.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/kabaguketi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a11033d654c---gimipozuwa.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/41783181165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=social+auto+poster+nulledPDF 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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 10684 bytes
SHA-256: 9fe216b327010db1f8cf1870aa64e878018ce27224832c0aedc9498f43087214
font_01_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 21884 bytes
SHA-256: 53d3118ab63d83867f377404846de46df313033400168249b641d1833131df00
font_03_sfnt_off00014ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1