Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c57bc433627a23…

MALICIOUS

PDF

94.9 KB Created: 2021-07-27 07:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6bb3b6c064959f35b7a4f6d5feae884c SHA-1: f6f8a723c09fb187aaf6f4e6d6658935f5983758 SHA-256: 97c57bc433627a23ba9bf5d1ed0ddb5577a452e4924c70f9671ae411bcecddfe
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and an ML classifier assigned a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, with many embedded URLs pointing to distinct, potentially compromised or disposable domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.gesas.it/media/mailinglist/file/rereluxujikoxet.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e6b63e7281f88686c0cce87c74271009/38010049473.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073edbf4ff28---fofazegawutupopeja.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/dexupadalami.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/buremif.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cee4b72bbad---xumaruxarafu.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/11945453343.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d157550bea00d53cc31ea8cb3694f282/vujogeg.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/9709464606.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/78480320236.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f592ad5fc4362dd13b9455023f782534/tariwibuwenubud.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/15172654308.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/98847775855.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/31713928861.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/girum.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/mosapojaxej.pdfIn PDF document text
    • http://santeh.md/img/files/koradef.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757d89a0d5c---66480805941.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607da15ba9d7f---8330668875.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/8081311167.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/68d8ab6280cc08d6f786f3b5c7a770d7/rokizevukixoj.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/kakevoluvetizokoganim.pdfIn PDF document text
    • http://sushi-belovo.ru/files/naduvezawomafovoxip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+a+mob+farm+1.16PDF 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_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 17424 bytes
SHA-256: 53b0e34e52f658e9ed94ea5c97c8a80592837a49dc818300bcb45c6f51a86070
font_01_sfnt_off00013d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15567 10560 bytes
SHA-256: 42bacf1227f140ec9c44fff496682ebbdeee37515c9bbccb44bbca2fa7f7fe85

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