Malicious PDF — malware analysis report

Static analysis result for SHA-256 552e0857b2cf84d8…

MALICIOUS

PDF

94.4 KB Created: 2021-07-13 07:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d34247c4b69785779ee19c76be5b2a03 SHA-1: a90871d43207fd5ffdf382f143929af586ee84bc SHA-256: 552e0857b2cf84d8c967976fa80b47ef0d370f2a9f085b6b4cb5bc5e3f3d52d7
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, directing users to multiple compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or exploit kits. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/fc6b463fdaf63a9844d33570273766bc/29130605307.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba04eabbf18---94672352683.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/12336692111.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53de65c66---juxegof.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/65181762237.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/duwimisabomofujakavapuwos.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/40862366287.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ba932b3b9---72547655593.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2af8a7233b---46203951509.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/nitip.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7c94431e98b86df853591db5ae73c0f9/warivifuxomadudomar.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/98666413818.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092e872a06b8---55340271622.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/46186382332.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/damonujobaledi.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/03143eb942903831f6c8f19d5ebf491b/veputis.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/juvamipovikenodegotulono.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b7ec2ed78---nufopuxazugasekiwaveg.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/432be8edf7a74481115dbf4a34f5261b/dedikunimabogikasero.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/8473153d57b6317d69990aeb883b1f78/fekadavuj.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/62458783998.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/rixed.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba13582135---mabafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=curve+sketching+problemsPDF 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_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12285 18172 bytes
SHA-256: 4d5d33fee961ba0a203d62fca1accfb0f28a415cff1e10084888bb41fa6cacc4
font_02_sfnt_off000152d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D1 11088 bytes
SHA-256: 2200f449adc1bfb7fd13343bb53eb406c781182f703ca082393baf55e2d229c6

Open this report in the interactive analyzer, or submit your own file for analysis.