Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4214947423be5c…

MALICIOUS

PDF

93.5 KB Created: 2021-09-04 21:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 467668ea1653d63063ab88deb2be12d9 SHA-1: 56eb07e8f36d0324a317c52b680ddb333e90ab88 SHA-256: 4c4214947423be5c300dded6616aeac09edeaac75ae0058aaa93decf1e13d7b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://facade-metal.ch/ckfinder/userfiles/files/lobepekiwupazakora.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8a8d37205df0781e8271ad0ac72d3876/nakuga.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6f35b180---89003281773.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/6ce180909923827e63a8f17530287630/56926637960.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/gezovogotiw.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5jh3bq9v2mdago6cbhrn08p343/fejaxo.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/runamevekebisef.pdfIn PDF document text
    • http://elskenecologie.nl/files/vafug.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7802e569---zavolodo.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/327721c68f216b0b65d6e6cf770a1c2c/25510283594.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbeee5ee8c---zoxelojezaza.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/74804451356.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/buguxeput.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210710045633189.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090f41136c7a---20745688712.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/diwufepaponoketusikinexa.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/77d7034d80defe8a61e8fe87ae2ceba9/84512137955.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c5190386aaa---gedutewab.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/54836018991.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/fajakorosif.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074564c24939---toxiguxomatud.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160848fe3473cf---39079472514.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/69b878b923dc6960f7df2697766b4d77/datorazagotepijefe.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c5ea89a8f---20963065776.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3517a75c3---xewotunamezunujewejawumew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A8+pdf+%D8%A7%D8%A8%D9%86+%D8%A7%D9%84%D9%82%D9%8A%D9%85PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d1fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD1FE 24696 bytes
SHA-256: 62670b17cf89a1a8441f0919158f35b7d3da500f16c778e15e30e3d2d320dc0a
font_01_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_02_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 18416 bytes
SHA-256: 0040846ae96ed10af71fe958f4e8d3b78fbe131c56eb68f0fcb205237206090f
font_03_sfnt_off00012f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6E 21368 bytes
SHA-256: 77921e043b26e1e71fb5f6f2136d1def5adc9b56cd74f4438fe77a4a897a517d