Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0ac409f9e0bf8b…

MALICIOUS

PDF

83.1 KB Created: 2021-06-28 14:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d879416ab35d58cf4368bf4758a659a SHA-1: a67fcc02f0b43aea292fdecd87ef0af20f3b6936 SHA-256: ad0ac409f9e0bf8b8769f4541a45681886e9cccdcb080d17d7f29252f78c0028
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kapelski.pl/userfiles/file/44054591483.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0b9be129---36501142433.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607682d1b1de6---30093584886.pdf
    • https://mmszke.hu/files/file/fivevirudamosirebaf.pdf
    • https://locoffice.ru/userfiles/file/47398873744.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae706bb40---fuvebalajubijasu.pdf
    • http://thedreaminitiative.org/Content/Admin/uploads/files/zodunibi.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e6a86f41b---2220044492.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be84d3815---movokuxipomijiwunimulo.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/2c27154071148acafb4e247b22d889a0/85700675031.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b67be9da200---12723606449.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/7bbd736e491fd5453053be4877c760f1/56319168581.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078295a55a6e---98411718663.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446279c587---nogududopefifibunib.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f36c7277f9---ralinetegewenimurubir.pdf
    • http://wecans.net/_UploadFile/Images/file/pazunireruxobase.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c6421a73b---16520706365.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8431d2e910---58452208075.pdf
    • https://vanphongphampmc.com/upload/files/vupijofe.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a751bc9efd8---75720061240.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/28164698249.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aeceadc281e---8123501092.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d428113e4c---74627730138.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=woodhaven+freewill+baptist+church
    • 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_off0000e012.bin
6234811fc92c377630b4cdd5bc20db959cb0427bdb4d8f61eabaa3a5e113e156
pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 17396 bytes
font_01_sfnt_off00010d85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 16792 bytes
font_02_sfnt_off0001259c.bin
1e029bc7613b71cd332bd36f63bf47eaa55dfaef3b21f75b498a61d6fc91581b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 11100 bytes