Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e3a3e7c675c5c2…

MALICIOUS

PDF

91.5 KB Created: 2021-09-04 21:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4919642366b0a4e96e03ba8253e575f1 SHA-1: 11e946d29781538c1356c2b3e1446d1a4f242d88 SHA-256: 95e3a3e7c675c5c2a8d58c13ce7758a988e44e2242599bfea3f17d36664054c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the link farm and the detection as a Trojan indicate a likely intent to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://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

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