Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc4c7267334f196…

MALICIOUS

PDF

79.5 KB Created: 2021-06-28 02:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e47b393933ed3c2fb771a538cbdc66b3 SHA-1: fb501357c3b986f0ff4320a4f8b0c4ead5fff22a SHA-256: 4fc4c7267334f1962a078dead84fda226afe0ad67a7f7b140a5c9ec810ae56bb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=find+the+missing+addend PDF link annotation
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a20119636---32501521651.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/mitina.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b96068a96ae---90069253913.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/275734668.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7db31b951b5d0270b285beb2598251c1/kadetebisawitojagebow.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e594ffeb---22331097753.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdb56d06d---dotilajafi.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/fodeleponifaropi.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/1mftr7crf8ivtgqiaikulbeta7/lamuxadabotuwewasaja.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a481e1992c3---38395944471.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/95830093341.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/nakofede.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803a33a59cf---nebajopuki.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6301ae5f10---48209385714.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/kafevogabediwotosunut.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609954eab3b52---37413965508.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609edec877718---91711804783.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/832c0c0d2404c5108e266a4594eba1f3/dujeb.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/kofak.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/vosekagafuzevabam.pdfIn PDF document text
    • https://mmszke.hu/files/file/3750459646.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1c76ac9022ef2f363bc813824abf26c5/71664302233.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba701e649---sewaj.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/23542617406.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/12224037445.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776a5f8f780---63868537871.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_off0000d342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD342 17780 bytes
SHA-256: 3b198fc8a8d82508c3966e745eaea57a660ff01117a9c5220e8e781ced6fe19a
font_01_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 10404 bytes
SHA-256: cd5b69d9b6c29cdd78852565c05e86be26cadd15e125d7ae0f3fea419d7e6cfd
font_02_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1