Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c681ebc27e3148…

MALICIOUS

PDF

88.5 KB Created: 2021-08-13 01:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9b841b530bf62e56370da45bc452d9a SHA-1: 38939666f7203d9940fd36886c87956c46d01279 SHA-256: 53c681ebc27e31489eda33d0f9e77846a928e847c340752303aac1b992646d0d
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites that host further PDF files. This suggests a multi-stage attack, likely for phishing or distributing additional malware, leveraging compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b208a6a03225a93c36328c4b5e3bf0fd/wudukomasilenedixuno.pdf In PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2ffa8a30---mudifek.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0db3054928e44bb96e6b8e97994fabaa/bolilux.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/bcc4136807dbf15a931b4116c9284b80/numipewutom.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/ponojevikukofolupufon.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/nedorazulesefetu.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/98d628c91a034b82b41433504d6803da/firuzirovunubozikafovose.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rje57jrd74el9ll6eo5tf9ms03/peveduzokojemikajutitado.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce7109380---64909558825.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c4387e1b---zabebamume.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/vomesotawumosujob.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/tufulubuki.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c68ffff98bb35dfb0b283c2f47dd232a/tukupugifamejale.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4acfbc3c51---kevuwosotefopi.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/41000622310.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/58323053739.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/80816707347.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/gufabol.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f141ed43dc3f3679d75fd6cada22ca74/jogazewiw.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160afa29903852---nerekelopudawuba.pdfIn PDF document text
    • http://airfa.it/userfiles/file/41416368941.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b3e3efbc6f0f751cf333d02534f0a2f8/gemudibozenubaremotuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+change+a+wordpad+document+to+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 17440 bytes
SHA-256: 8ef7512996ece7e604d0e4e977292c1fd4d643fb9a50fed0234eab904850ce7b
font_01_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0C 11028 bytes
SHA-256: 9134772a281c1ecddf221d613830c7d84fd660f9e19cbb983d65164fdfbefbee

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