Malicious PDF — malware analysis report

Static analysis result for SHA-256 04208d43fa6b8195…

MALICIOUS

PDF

88.3 KB Created: 2021-07-16 04:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 57bb41d46a79dfb62e65f3237d7a0812 SHA-1: 9844db27e4b7e93322d0814ed5cba48b1db892e9 SHA-256: 04208d43fa6b8195ce5e11f0cd224efa88f1fdab0aae512d3fbdc1c3076de288
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous external URIs and a link farm structure strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/5u31jlb798itqfg7nl8sgi4976/54606828034.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5e77e809fcb966d56710ca3015ae3159/datiwurelumaxosoroparivu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/98169598739.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc3572af3c---30048598217.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f630493d---64901900606.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/73504088441.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6b21d553---zidog.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fbcbb70c47e2c05bf6f0d54e1d4c898/91160116388.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/0kmfct258pvf61v7e5bnrvt8be/94250717383.pdfIn PDF document text
    • https://aedwea.com/upload/foto/tukarubirisepinu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0268aaeb16---71092044302.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ff277a663---mosutelojikutiduziso.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/3573e56f8af0f6bde8facd68ab1c498f/13243521960.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/velegukoropabijasufel.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e3c6170e609c9b7b9016ef91ec7ffce7/kizafaxunozilamujepa.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94b573827---66448309303.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5d7017cc---kesilugubesamapuruzoson.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/lasijoluvuborikukedab.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/93820420639.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/ludipufowixi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd19debe3c---tomapukovisi.pdfIn PDF document text
    • http://hongdacable.com/d/files/wizulobefedigudokatumete.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/hhhq8us79ofuovjovsa6a70fi6/91501497056.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92188654b2---348481838.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ho8dd8g0b2b31972c15cka6u97/wevijosusigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=appeal+under+section+37+of+arbitration+actPDF 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_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 16704 bytes
SHA-256: 58dab483836711331197a529c6e6f0442302bb58835e3ba3c176e8e2afb56d47
font_02_sfnt_off0001383b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383B 11056 bytes
SHA-256: 12e07cb6f2334bdc9bbd3da4de14f86899b6462bfb286381183f932f48e38b2e

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