Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0e62655f5201f5…

MALICIOUS

PDF

73.5 KB Created: 2021-07-25 19:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 390943fa648595047e1876203d442841 SHA-1: 39581931163db5458a254075660151e125e74ade SHA-256: 0b0e62655f5201f57d8653cab89827767cd5814b9572efeb6f6df37af726bd68
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics show a malformed exploit stream and multiple links pointing to compromised CMS uploads and disposable hosting, suggesting it acts as a lure to external malicious sites. The file likely exploits a PDF vulnerability to redirect the user, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5dc4da70771e7f7a0c4cef5a394515e0/50971506143.pdf In PDF document text
    • http://busanpc1.com/upload/fckeditor/file/70279697533.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8781ea11---kowajusarolojapofo.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/205364da2dd9844a09c79a3a88c1b8b5/91237150737.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609024a5be464---dabosiz.pdfIn PDF document text
    • https://atlantidegattico.it/file/39343042894.pdfIn PDF document text
    • https://anjingliar.com/contents//files/zodawoviv.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ffeafcc157b68c823aee8532801e2cd6/16582770680.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/bupajisujorujufizajijis.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/81463852172.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d037e5241---zupajisefow.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba203d1db1---34944175527.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/dojefakuxujegowegudikup.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/cbhjkh7rp0qbnqvdn48clhpal9/30313611768.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/47419763134.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa341d76f---21994294842.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m5oqdd8i5m3kocaailctck9cb1/72268767245.pdfIn PDF document text
    • https://mauspro.net/upload/files/39988158369.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kulifotukemudezosetofekog.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/444e92cae0427346b43e598a9c3a2b3e/82957812149.pdfIn PDF document text
    • http://acril.ru/ufiles/files/46132775412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+prefijos+y+sufijos+4+primariaPDF 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_off0000bb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 10796 bytes
SHA-256: 4430bc9c8a62a3abc654b763055aa10aec87e9b20e2baabf27be76d13d40971e
font_02_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 16800 bytes
SHA-256: 005351e18f683f74b7a2bc26be537b04c1096f8dbe3fcc411ddedc09b8f1d461

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