Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15630d8a8c61f48…

MALICIOUS

PDF

117.1 KB Created: 2021-07-15 21:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7ba7a6fe3abb17ee9c87126eba9281a7 SHA-1: 2d320c4568ac821c55dc063e82c0fddb67206986 SHA-256: a15630d8a8c61f48d55d7587c8f7eb2e52f3eec0202928979b9252de2d82cd2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The primary attack pattern involves luring users to these external sites, likely to deliver a secondary payload or conduct further phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kkk9bukeikdg7d8ko0b88l1mb1/52571099457.pdf In PDF document text
    • https://maturana.cl/upload/file/xorevojof.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/fojoluzuwiwub.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/zogolid.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/juwidafulaxif.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fc41a0225---rovemojugev.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ce060a63eaf2c1f697c81221164526f0/45711158035.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/wivotolagemefipuzuxeg.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/63427570186.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/temub.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/917319fd14426a0ed8ea799a4671aeff/44738528080.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5dp6c9atm48k109ihk57mmv9q1/14173158890.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/dosinugenetud.pdfIn PDF document text
    • https://melz-feu.ru/upload/zarofinovipinesonotag.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/2572708954.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/wifep.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/50286891207.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/07cd67cb65d3a9e961bd698578e767ca/rutakurudosexorupu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76a545566---92687492362.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/vikisagujosapapeler.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/25754430539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=reach+for+the+top+questions+and+answersPDF 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_off000166fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166FA 11048 bytes
SHA-256: 3a6113154b14bcd8f8e050d4fe3a1b7106d32000c8734d82c98e8439ff585fd3
font_01_sfnt_off00018082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18082 17888 bytes
SHA-256: b632c89e2b29a9f9b3b7633c43a19d8417ef72cff6ef22d4111aede8b3467271
font_02_sfnt_off0001ae9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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