Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef878aaa59ea957d…

MALICIOUS

PDF

87.6 KB Created: 2021-08-18 06:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d1da7efee9b7cc8d05f5bdef97b1da0 SHA-1: 26ef4ed6382eadaa59375afc2b400b701d886b03 SHA-256: ef878aaa59ea957d5d650c3e9c19c3f6e0b4694c420e5ffc9b90c2c124052c31
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, a common tactic for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://greenplanetnepal.com/userfiles/file/vogojegidagile.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e938a4e7c---53898493624.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/37135215813.pdfIn PDF document text
    • https://fallsplat.se/file/tomokosoragipi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5da1e14a65---78525854920.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/nexakolopilamubaj.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/416b067497c25177ab54c028ee09ba75/gifedolavegadivos.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f42ff2a3afb2f85590e344e634062201/nubid.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/donizarijogor.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/41450640596.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-11/20210811012405662153.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98a02e2b6---86743224852.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/68315758170.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/5462113776.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/nefuzodedob.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/fojifepodesixuguselusepe.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/fudenot.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/vawamosiv.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c8534c0aa---38787891380.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/m2fe4pj1tlqgro9tp5vn3q0pbd/47016045031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+more+money+on+sims+4+ps4+cheatPDF 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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 11044 bytes
SHA-256: 6d184e26db24e9d8269796117f31abac2d81d31b5fb41cea09eb82442031eea4
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 17188 bytes
SHA-256: 8875c1ce6c59667a6264288e73cecc5987af7735877a77619a712e1a52e643bc
font_02_sfnt_off00013608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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