Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ee8b4a1d90b76b…

MALICIOUS

PDF

83.2 KB Created: 2021-07-01 14:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9676f3ece89f5643264807116d44ff14 SHA-1: c18b9be748317e2e75aefb796369a4375678b161 SHA-256: a0ee8b4a1d90b76b5148bf83839cdedcdf51340f44c120d1d936273b55750367
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=what+is+dynamic+risk
    • http://goodwill.pl/userfiles/file/31313071193.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a9acb053---28240201737.pdf
    • http://vnos.vn/app/webroot/uploads/files/9213973339.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210605001940.pdf
    • http://billedbutikken.dk/articlefiles/file/69465332703.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608926dad8399---rabajevot.pdf
    • http://kapli74.ru/upload_picture/zowexukup.pdf
    • https://unosms.us/userfiles/file/taxudepotileravobotur.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a44fb6bec---kuvesitajafobakot.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f441e4ee---84778603174.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c19fe54b78a---65303704734.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaf39cbdc2---gokudodesu.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736720358dc---64180460996.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/aa638a88265ab50c457bdff31fa344ab/xevotiludepugojak.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080998cdcb99---roxugiwevodef.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082060cf2d14---zumofu.pdf
    • http://ajivikafinance.com/userfiles/file/tajuv.pdf
    • https://flyingfish-stay.com/userfiles/file/poxibexotazubafibixivot.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/60757617872.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c173916b2f6---85326035898.pdf
    • http://grimastone.ru/files/jufavur.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8f15435456119728d6e4db1ea2fcdb17/20194143155.pdf
    • http://thepnguyentran.vn/media/ftp/file/94433553824.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_off0000ddab.bin
0a19b8bd6ba5c6270205b8ad6be0ed74f39ffa6143c2c97f5e42ca5e49d7e096
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 18856 bytes
font_01_sfnt_off00010fd4.bin
c6369696284a431d06e2f80863a0c6ea9f8f888e61e329938a10e591bcf31b7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 10536 bytes
font_02_sfnt_off000127aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 16792 bytes