Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17c0b22d941fd19…

MALICIOUS

PDF

82.2 KB Created: 2021-08-17 11:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b0c81f16affc6928d6949f4c4e8c223 SHA-1: 98b4a7aac8f2562ce5914773bb0a0492a037406b SHA-256: f17c0b22d941fd19b5cc9adf135af01ddf7cadc4fa59dc89fd53d878b8c8c5ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://le383.com/uploads/files/45817161659.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b402e4c4990---godokitomutinoder.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/b1bkp1usi5tu26nkur9ai5hd8r/kuxiforodefo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/adf1214b141a125685aef260be0110d1/80587581200.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e21107e30---vakenedajugufos.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607178bac4d4c---46283152318.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/oufhsn21oq7rg29sdno6145ese/dimilako.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/psjmo5mpbvkf17931tf63r3p8v/kofupifowapakifurodax.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/39700056848.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7816576001.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4bbce766---mikumutoduxizoruw.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/3268884160.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64d069107---pevodutopedutugazorofebox.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/sebagiwalabe.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/75283639328.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd5dbb56bc---80803819372.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/pimepixajudewad.pdfIn PDF document text
    • https://magerp.org/upload/files/92031590434.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/bajamoroxejulejalesalujif.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/2626699437.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/gapokosopiwosexuwoj.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/14404517690.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608261b30164d---kupizebusuwo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c6157d990---83302559007.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/ea451dd7185c4a3800c778e08f7ee5ee/weteregemupu.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60fc71e259833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+apple+music+on+android+autoPDF 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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 16280 bytes
SHA-256: c319ba5841ed699bce9f8efe82cc938c528db3d965d60f67bc0f4e16b8dfa45a
font_01_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 11032 bytes
SHA-256: 64d724620e599fe4208169310e1892164b46139591670d5b2b03bb878878be53
font_02_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1