Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf9f15b3cecb836…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 00:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65aa962476c715bb51272c4cb057c3e9 SHA-1: 239766ca5553a9d18855a54394e139e40b4cb08a SHA-256: bbf9f15b3cecb836f3c4e81ed539e46b8d31b46a2254ebd0917161ad8a05d7c4
96 Risk Score

Malware Insights

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

The PDF document contains a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. This suggests the primary purpose is to manipulate search engine rankings or redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=a+doll%27s+house+part+2+characters
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/oh9to4c0vm35ef7gs3cvhijn05/54057083468.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85fcf43e4e---vabubobezeba.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/dc8a6cfe318bdb2b76cb0e3b1f397b75/45031824604.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be1fea3e4---sekusi.pdf
    • http://sclifeguards.com/clients/16854/File/46966394353.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160771d133ba80---27622592601.pdf
    • https://grupo-kayros.com/userfiles/file/4702804881.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/33262660090.pdf
    • https://aashianarealty.com/file/vumalasitofudoxumewe.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//38881927964.pdf
    • http://gerd-pollak.de/userfiles/file/jabosexox.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607333f3966c5---15529467184.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb731c2e13---94305916438.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/56267620642.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4afc90b4fd---59101852204.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/61470442161.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/seviketaxaf.pdf
    • http://kowel.com/ckfinder/userfiles/files/1624809061.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8hdl491nmf1mslaqq98v1so6qg/vijok.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160872cf4d060b---zojugerevoku.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860b5d2bc4d---kusogiruwiwitug.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/93200777543.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072b6ed4ef43---suragidilepalijazi.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/eaeb03eb2290d6bf90b4dd86dc4ab307/wazewadebimunebamefa.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/wobogozo.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_off0000ea7f.bin
1a9945cc403596cb03417d9f3780e24f522944adc7b400875701e928bacc1bac
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 17736 bytes
font_01_sfnt_off0001185c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 16792 bytes
font_02_sfnt_off00013073.bin
b7e431092d70be11f7ed0ab81bd40becf9782c0eb7b2345022df6d98f3e2213f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 10648 bytes