Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82d398a56bc41fe…

MALICIOUS

PDF

85.0 KB Created: 2021-07-19 03:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f2b354824a18a453279f8eb4397851f SHA-1: d69852ccf3c2306655c8ca10c72a2b538f85e5c4 SHA-256: e82d398a56bc41feab2b371c1da64585a7734d7791a44ba88e3f13d3461b9d76
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dui-antidote.com/images/userfiles/file/polotopojet.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607025de93958---xemagisuxubuzeka.pdf
    • http://jnafarms.com/clients/864068/File/xuvoxejavafuzasara.pdf
    • http://jgbt.us/pds/userfiles/files/57476727236.pdf
    • http://eko-inwest.eu/upload/file/fusese.pdf
    • http://reunionclass.com/clients/7469/File/lokerapibetuwutozivuji.pdf
    • http://morethancars.nl/uploads/edytor/file/tewimidoxosas.pdf
    • http://cuacuondaiphuc.vn/upload/files/42436521176.pdf
    • https://easy2ticket.com/upload/files/51957181090.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c19daeb9544---soxulizukurapogogalasalid.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/makubatobavudotapurig.pdf
    • http://ahlhy.com/uploads/file/030837171693.pdf
    • http://farmaciafici.com/userfiles/files/89607929350.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c6985d3e1ab---xogutoniwefoxuzelu.pdf
    • http://dulichgiahy.com/upload/file/rixovasagezexadisap.pdf
    • http://medicapoland.pl/uploaded/file/borifuwolemoxofuged.pdf
    • http://csc020.com/userfiles/file/20210630023413_s9h5aw.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/bl16693umnrm9kkek2q7svdfgp/26948307420.pdf
    • http://taiwan-tsai.com/upload/files/nutewukodidikewaminikaf.pdf
    • http://jjinline.org/file_upload/file/satinevatoporakodivewur.pdf
    • https://robertbah.si/files/file/12779482781.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tapeworms+and+pinworms
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 16792 bytes
font_01_sfnt_off000103eb.bin
44b4368d9a6cdfec614455bb50d03dc2a0406304446584acb496983354a9ff7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 16648 bytes
font_02_sfnt_off00012f38.bin
cc495290aea6cf14393f2264239a045ad4812ce89e0c807f38349c9a21d59f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 10460 bytes

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