Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d32d22990364535…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 01:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a6f08b5effd390790a62edd38f89e5b SHA-1: af2ace2ae399437ae77262a64caada56960101ea SHA-256: 3d32d229903645350d70a2113eeabda7fb97ff6c18056c24e834020412a582cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=short+non+veg+jokes PDF link annotation
    • http://sgrappresentanze.eu/userfiles/files/memuna.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4090ef3c---pufewitapo.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/kowuxoxadefafaluvixeruk.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/dozogezome.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7d32248220ac06edc161b48603d3d172/75644204601.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/51717331326.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffaa58a4f---27931692399.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99abf08a5---doboxanole.pdfIn PDF document text
    • http://www.moyekolodin.com/files/goruponadufa.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6v6eof2uc47gipitpbakq585vs/16304445107.pdfIn PDF document text
    • https://aneri12.eu/res/file/75374804531.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/78749166897.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/najokamolarixale.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/24634983751.pdfIn PDF document text
    • http://idcla.net/upload/files/82525042139.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/xojinel.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/91749642478.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/78471786901.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/1283909030.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/liwobevur.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/82723163930.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/80482566120.pdfIn PDF document text
    • 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_off0000be60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE60 10452 bytes
SHA-256: c4c0b648e0ede0dd11e802fc815820103427590aadc697757aeee1777edd12aa
font_01_sfnt_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 19136 bytes
SHA-256: 798bfd80575e4f6a3481ff87bcf7f91b9e122859c7f1a91e415aff8b9915ccf6