Malicious PDF — malware analysis report

Static analysis result for SHA-256 d873b51301d64070…

MALICIOUS

PDF

91.3 KB Created: 2021-07-02 03:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 708dacdabf9fe2f214c9ea5d6ac6234d SHA-1: 3935ed15ff0910b69c9a5efa36d48107e2fc779c SHA-256: d873b51301d6407054965cc0a53a2f46927639928b0a2cb86abbcff9938af9b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c4382ee3f779a25fa84426c4c4378d73/64768877048.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf210e161d3---81195609967.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a88cd95f11b53eec0f44f14abab1ff12/6801020139.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/320323d4d3aa4bbb9eaeb5a2a6c4608f/28044229981.pdf
    • https://naoshima-habitant.com/68375480357.pdf
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/lelonemivenux.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5e212b5a9b32d23182a9384a58c746ed/rejuviremepaj.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a7d4f595---26921790289.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/cc0ebca03265287d33a7db1167d9b3c0/fogujazozezo.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c6f49719cf9e4d6d61f71a0191d670f6/76347781364.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbc9c7c2e6---38435749379.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/v0muethrhiioc7o2sg1vfb85df/wirilif.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb8274f8f4---mutineja.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b81257ebe10---rigawaxurozutuwexoxo.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/lixowosigomusofiki.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b76bc420d80---7559756446.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecb84ca6c2---76535581570.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/11564964290.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oh4m40lilq4ekkbe2b8n0qa3hb/gumos.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d2bb6e7b4fe8eef0c197edcb057aee10/buwuxedagovezal.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/548bbd217db4949c93e47c03182f651f/55627929573.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/tazuvit.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b00f04e3f---kitezidubifixiwadapuwiwas.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/ratedaxazu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+the+word+allegory
    • 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_off0000fbb7.bin
f610339e53f4f81363c342bc7433fdb5215fd04644398ae2b385266123e9265c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 19360 bytes
font_01_sfnt_off00012e40.bin
2f915c57ba1b06c7220738e55053ce7b4946c56171e1b8681d4f639e2ea0134f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E40 10656 bytes
font_02_sfnt_off0001466c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1466C 16792 bytes