Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecb0fb28812790a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 08:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8254542ade71cc5c38698adf0a5d951a SHA-1: 7a3e25e07adb89c7349037a2d290a297d30e5655 SHA-256: aecb0fb28812790a990131b9799fb02366c33ae6d51461fcea48f8d53a3c0462
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The presence of numerous links pointing to various domains, some of which are identified as compromised CMS uploads or part of a link farm, suggests an attempt to obscure the final destination or distribute malicious payloads. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://app0.linkeo.it/ckfinder/userfiles/files/wegoluvotelevupurixa.pdf In PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210917_002254.pdfIn PDF document text
    • http://kustari.net/userfiles/file/vedoxazinutov.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/29609000832.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109060922316183.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/97966013140.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/72492069683.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/gagabe.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/bidomuranevom.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/gomebogusijibegumuvewaza.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/84136977926.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c634613c2---mafetid.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/fuvumuwifirubitowa.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/ginov.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/62852457669.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/maporilefekewawes.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/55511347860.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/wekapovotapuris.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fe8757c17---vorotujatereb.pdfIn PDF document text
    • http://poliinc.com/upload/files/57021600630.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/tedolipuz.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/fabebar.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c2d64f26---keridix.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/nonuzizaxipegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=rodin+calais+burghersPDF 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_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 18912 bytes
SHA-256: 403662e8a34dcaf81288e0d73aabe14cd0ef23811bb15790f2a6103807bf036c
font_01_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 10836 bytes
SHA-256: 1acc20ead162bfdd7d9d57ecccf08228730d15f9f038b4898ec4995fd34fd3c6
font_02_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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