Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30286fc4f05c1ae…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 08:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f595bf881fca2f45e4c6f0835b01b4c1 SHA-1: 3fe1be59255bd8ce1cb2f6103ad32a1f14b09a49 SHA-256: f30286fc4f05c1ae7e1933617de4bf0bca2c9c558f620b15cb92851e248a2401
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nomylo.ru/uplcv?utm_term=math+multiple+choice+questions+for+grade+3 PDF link annotation
    • http://teormech.ru/teormech/usrimg/file/95400271559.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c667d8b76---vafekejarurafotora.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/93264140455.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/02miotumlbbrbp1bsv7pkbo6hi/82871956078.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa35b1ad44d---35775276148.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/8834063412.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d781aa6547ab616274492f33d9b78526/lokoboxatukamibel.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1611b861a6dfcb---sikaleviwo.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8rsgitvabqthm7d0es9uotgpc9/wafoniwixofodovevalumuxaw.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/gujalarejuwubutogape.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/besuravoma.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/pupudejuvesejodafujit.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/bae44cd3ad72949168f1f9cc4dc182df/nizerokesa.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49615b2ad---kulisepafadefesule.pdfIn PDF document text
    • http://cartopack.be/Images/file/23796728800.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d91c8c676---reravaxenofebumi.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/tozepajipedefuvola.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/14447235988.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/vesilofilubonizupowutuz.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f99b0ea58d---11812360640.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e45020e2cf83157399ada08b730c95b1/xebifepositilol.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/b2n6eqrpn2d09sc66o8tem7c6h/58442600779.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_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 11480 bytes
SHA-256: bfdac04400f6cb76c07e33e852c4e4748bde5190c7426380ecdd1e29f3cb9363
font_01_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 17420 bytes
SHA-256: 4aaf016c28b4d6990bf86568344db1ec8a3b4eae91ddec04d6d23323e8ee1070
font_02_sfnt_off00013aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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