Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bd8497a02d73fc…

MALICIOUS

PDF

87.6 KB Created: 2021-07-10 00:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2a6eed8a29428c2d1e47281cc63a1c9 SHA-1: d063a5cd6fe5ac62c66ea9b672bec35ec7ab03b4 SHA-256: 18bd8497a02d73fc555742473c65cd653b83456e5db10c7a7d477ced1bc046f7
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to host malicious content on various domains. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cameradungphat.com/uploads/files/80214215398.pdf
    • http://afghansolar.com/userfiles/file/20796891558.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/e5m52il1l1turld5vmegs46jlu/jebutizasipidopure.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/74247862786.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608116c69568f---26172770683.pdf
    • http://dobrasekacka.cz/userfiles/file/85195308821.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7700fad1af386524445ffe79506e11ed/vilexojovivibiresesoma.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ffde4e386---66386045030.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607297675dced---dokiwepalobatepisugukepuz.pdf
    • http://dzbnf.com/upload/file///bopatupijotukitosa.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210523020704.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j05on5ot7vbbi2aim61lf8ho96/94868524366.pdf
    • http://cpk.by/ckfinder/userfiles/files/bapofokejimogidenenirovoj.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c896d199794---53819129739.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c9ef77046---27482920345.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8avpjt223m0go3b58aip3cicfm/tamavenunube.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2419b296---43003304327.pdf
    • http://sys-svinding.dk/userfiles/file/xibenumazirojofe.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/711c2bd0459c2a5bed48b93b9c58e6b2/sojebagikubi.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/88543c34dfcc37b419d4020590371ed0/74895299092.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rjfeass9de85ejekddtqlduns4/muverasuxaz.pdf
    • http://21cedu.com/pds/userfiles/files/16899463021.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/36pvjefbitt4cbncpljok1h482/38285111463.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=assurant+my+policy
    • 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_off0000f351.bin
5fec0230e1418ef4b620bf6f927c10e7468908feb06b70725319e0b08a02d98c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 17648 bytes
font_01_sfnt_off0001215b.bin
c18562e09c422a972ac46aff2e1d072d092826d66f2ee47249ad1a4ba18ecd12
pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 10600 bytes
font_02_sfnt_off0001399a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1399A 16792 bytes