Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1974b932a38c089…

MALICIOUS

PDF

89.4 KB Created: 2021-09-06 19:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e7bde3b3d469ced48ff9891bfa8db77 SHA-1: dcebb02fefd195ab34745303b0ab47e9d8c569ce SHA-256: f1974b932a38c089d9c3d675ac9ca298133cdcacd1ff5be197f50e6eb49db5b6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains malformed streams and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It also exhibits characteristics of a link farm, pointing to multiple compromised or disposable hosting sites, suggesting an attempt to distribute further malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick users into believing it is an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://geometrarontani.it/userfiles/files/tapaxegamejamamusuzosol.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/hd6f2m1vdnd9opp33bnvkhva59/89559334671.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/af47bb6bfd8fb7f2049e1f6ed71a71ef/10179554707.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d805025ef3---94986357989.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081137f5504f---68860937906.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/57561046184.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/tasuve.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/voxuzewefuzixete.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1b7f9908f127b5aae4023d6da1b0ffd8/fozopuvuduregumulojo.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/74320314851.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/af048ba5381fa5ab5305a2670044a0e6/87376946011.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/unhadmo2qsap0tuq0pru712h4r/kizubexakibefeluvonapoti.pdfIn PDF document text
    • https://bauarch.bg/files/36896888159.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8823b052b419a67275a95ac39dea8d90/69263858712.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/a6857d5057e98b2f118cf96fd836537a/vulukizelatomu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607863fda6302---xodexizasaxavuwufasuzos.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/kevapifizo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/62220500068.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/55322050338.pdfIn PDF document text
    • https://andhimazhai.com/images/files/75741622611.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6da4066394c9d283e68509db1ee5557c/sobulawerivejidugazutimi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e61c8942d---94154838985.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a7629d415b98312341b63853969c66d8/kijivexibe.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/s7spn67rccghvqu5eaeegpt6r3/valitetaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=my+best+self+working+card+tricks+karl+fulves+pdfPDF 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_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 17072 bytes
SHA-256: a143dfb705fd5d5d4658613caad26a8696d24c29897e7f50cffb7d793dfcf75e
font_01_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D17 11384 bytes
SHA-256: a1dae4db7cf00aab5112a26040e894475fe1657ff0c07608fcc0990d9b1b84db

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